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04-21-2017, 11:21 AM
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#1
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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'86 Chevrolet 8.2 Detroit - Charging System Wiring Diagram
Hello everyone! We are purchasing our first bus tomorrow (hopefully!) and I'm trying to get a jump on the wiring diagram for our home bank, and well just about everything else lol. Being an electrician (apprentice) I'm anxious to start drawing this all out. I'm not having any luck with google or other forums. I was hoping one of you might be able to point me towards a service manual and/or wiring diagrams. Thanks in advance!
Also, after reading through a lot of these posts I had a question. Why are a lot of you running solar power or a generator instead of bringing the existing circuit from the engine bay to a disconnect, and then to your battery bank. If you're gonna burn fuel in a generator, you might as well use the one that came in the bus. This could also be a lifesaver if you were to lose a battery in the starting system. Close that disconnect and use your home bank to start the bus in an emergency situation. Just thought I'd share and see what you more experienced electricians thought about that.
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04-21-2017, 12:46 PM
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#2
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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Well
My apologies, I see that some people do indeed use the bus charging system to trickle charge their house battery bank. I did see that last night, my bad.
Basically just wired in a continuous duty solenoid, and make sure it's fused. Easy enough.
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04-21-2017, 01:08 PM
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#3
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Bus Crazy
Join Date: Jul 2011
Location: Winlcok, WA
Posts: 2,233
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Using the bus engine to recharge a house bank is not a very good idea.
First, it puts so little load on the engine that it tends to load up with unburned fuel which tends to wash the cylinders causing premature wear. It also fills the exhaust system with a lot of lot temperature exhaust that leaves a lot of excess soot and moisture which tends to rust and clog the exhaust system. And lastly, the bus alternator is not really designed to recharge a large house system. At low engine speeds it will be at maximum charge which is hard on the alternator and speeding the engine up just wastes fuel.
A much better choice to recharge house batteries is with a passive solar system or a genset that is designed to recharge a house battery system.
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04-21-2017, 01:10 PM
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#4
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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there have been numerous discussions on how to charge the house batteries from the alternator. Apparently the charge still needs a charge controller to eliminate burning up either the alternator or over charging the house batteries.
Many of us are pretty weak on electrical issues.
__________________
Robin
Nobody's Business
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04-21-2017, 01:49 PM
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#5
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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Quote:
Originally Posted by cowlitzcoach
Using the bus engine to recharge a house bank is not a very good idea.
First, it puts so little load on the engine that it tends to load up with unburned fuel which tends to wash the cylinders causing premature wear.
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It pulls to much voltage away from the engine? Is that what you're saying?
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04-21-2017, 01:51 PM
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#6
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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Quote:
Originally Posted by Robin97396
Apparently the charge still needs a charge controller to eliminate burning up either the alternator or over charging the house batteries.
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Does the bus come with an OEM charge controller? If not, how does it prevent from overcharging the starting sytem batteries?
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04-21-2017, 02:22 PM
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#7
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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So running the dual alternators would be the fix right? One for the engine and 12v accessories, one for the battery bank.
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04-21-2017, 02:24 PM
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#8
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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Correct me if I'm wrong, but I believe Cowlitz is talking about idling to charge the house batteries. Even at a fast idle I'd only do that in an emergency.
My thoughts were being able to charge the house batteries while on the highway driving. For instance if I've been boondocking for a few days somewhere and then moving on to get a number of miles down the road I'd like to be able to use the alternator to charge the house batteries while underway.
I am electrically challenged, but prior conversations indicate that the alternator could get overdrawn from a large pack of house batteries and become burnt out. On the opposite end the batteries could get charged to fast, say from a HO alternator, and get wasted. It's my understanding that the charge controller levels out the power output of the alternator and charges the batteries without overheating or overcharging them.
I don't want to get a bunch of electronics. I went out of my way to get a mechanical bus so I don't want to fill it with electronics. I'd also like to be able to charge house batteries from a generator when necessary, but there still has to be some kind of charge controller from my understanding. I don't even know if that's what it's called.
The charge controllers are expensive, not unlike the batteries. I don't want solar. I just want to have a couple extra batteries to run 12 volt appliances, like a TV and water pump. I'm a minimalist. Trying to keep it simple.
__________________
Robin
Nobody's Business
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04-21-2017, 04:28 PM
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#9
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Bus Crazy
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 1,956
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
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Quote:
Originally Posted by tlbeck1985
Hello everyone! We are purchasing our first bus tomorrow (hopefully!) and I'm trying to get a jump on the wiring diagram for our home bank, and well just about everything else lol. Being an electrician (apprentice) I'm anxious to start drawing this all out. I'm not having any luck with google or other forums. I was hoping one of you might be able to point me towards a service manual and/or wiring diagrams. Thanks in advance!
Also, after reading through a lot of these posts I had a question. Why are a lot of you running solar power or a generator instead of bringing the existing circuit from the engine bay to a disconnect, and then to your battery bank. If you're gonna burn fuel in a generator, you might as well use the one that came in the bus. This could also be a lifesaver if you were to lose a battery in the starting system. Close that disconnect and use your home bank to start the bus in an emergency situation. Just thought I'd share and see what you more experienced electricians thought about that.
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First of all welcome to the forum. Not sure how much you have read here electrically. What year of apprenticeship are you in? How much DC theory have you studied? Have you any direct dc experience on vehicles?
I take it you are getting to know your bus electrical system.
For most of us, our buses don't come with onboard generators, did yours?
" If you're gonna burn fuel in a generator, you might as well use the one that came in the bus." Wrong choice of words there? Did you mean the bus alternator? So running the engine to have ample dc power for your needs? Wrong move there as another poster has already stated.
Alternators are not designed for that at all, only to top up the bus electrical system and starting batteries. Not many come with a "house battery" system. We add these. So that is what the alternator is built for, not extended recharging caused by house battery useage. That's where isolators come in handy and can be added. Read the current thread on isolators.
Your way wastes fuel, adds hours to everything electrically and mechanically and not at all cost efficient in any way.
Like I said, not knowing your background sure makes me wonder about your questions or theory.
When others talk about charge controlling etc, I am not sure of their knowledge either. A good battery charger is all you need that doesn't overcharge thus you don't have to babysit it. But it's not a bad idea to keep your eyes on it anyway as one never knows when things go wrong.
__________________
Question everything!
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04-21-2017, 06:09 PM
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#10
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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Electrical dunce that I am, I questioned a friend who is an EMT about the systems on board their vehicles. Turns out, he can re-start your heart but isn't much ahead of me regarding things electrical. But, he did say their units run either a 250 amp alt or two slightly smaller that charge the starting battery, plus a bank of house batteries they use to run a lot of equipment off of. He knew there was some kind of "automatic controller" that directed the flow from the alt(s) to whichever bank needed power to stay above a certain level. He noted that their rig (basically an oversized ambulance) did have a separate A/C unit that was run off of either the alt directly with the engine running, or the battery bank with the engine off as well as a standard dash type A/C. As noted, he acknowledged a lack of understanding how it all worked, but said it was highly reliable.
Is anyone here familiar with any such systems? EMT units, Fire Trucks, etc.???
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04-21-2017, 07:52 PM
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#11
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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"If you're gonna burn fuel in a generator, you might as well use the one that came in the bus." Wrong choice of words there? Did you mean the bus alternator?
No, I meant the engine and charging system generates electricity as well.
Your way wastes fuel, adds hours to everything electrically and mechanically and not at all cost efficient in any way.
Purchasing a solar panels or a generator is also expensive and wears them out while using them. If you're running that isolator, and shore power while parked, I don't see what the big deal is.
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04-21-2017, 10:17 PM
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#12
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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I'd like to be able to trickle charge the house batteries while traveling. I don't know exactly how to do that safely. When I'm charging down the highway at optimum speed and all warmed up, I'd like to be able to flip a switch and begine trickle charging. I know the house batteries can't charge directly with the vehicle battery because they aren't matched, and the lesser of the batteries drags down the good batteries.
It's the minimalist approach to charging batteries. Would that work?
__________________
Robin
Nobody's Business
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04-21-2017, 10:22 PM
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#13
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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You could use the sure power battery separator. It uses the alternator to trickle charge whatever bank is lower than 13.2v automatically. It also automatically shuts down charging to your house bank if your bus batteries drop below 12.8v.
They're $110 on Amazon with free shipping.
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04-21-2017, 10:52 PM
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#14
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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That sounds like what I've been looking for. Thanks.
__________________
Robin
Nobody's Business
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04-22-2017, 06:34 AM
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#15
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Bus Crazy
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 1,956
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
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Sorry you seem insulted but what do isolators and shore power have to do with each other?
Idling a diesel engine is not cheap or good for it among other things, like the cooling system. An alternator puts out how much power at best? A generator can output several kilowatts at a lot less cost for an equal amount of runtime with less noise and diesel exhaust fumes.
The big deal will be when you have to open your wallet to replace that engine or other components, plus the fact you have no AC power to run things. No biggie is it?
__________________
Question everything!
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04-22-2017, 07:08 AM
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#16
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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You either have a hard time grasping what people say, or you're a smartass that is always trying make himself seem/feel intelligent. I don't believe your help is needed in this post. Thanks.
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04-22-2017, 07:21 AM
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#17
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Quote:
Originally Posted by BlackJohn
Sorry you seem insulted but what do isolators and shore power have to do with each other?
Idling a diesel engine is not cheap or good for it among other things, like the cooling system. An alternator puts out how much power at best? A generator can output several kilowatts at a lot less cost for an equal amount of runtime with less noise and diesel exhaust fumes.
The big deal will be when you have to open your wallet to replace that engine or other components, plus the fact you have no AC power to run things. No biggie is it?
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04-22-2017, 07:28 AM
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#18
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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Right, everyone should conform to one school of thought only. Why talk things out, or try to come up with different ways of doing things. Nothing good has ever come of that...
Anyway, did anyone have something helpful to add? Like where to find service manuals or wiring diagrams?
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04-22-2017, 07:35 AM
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#19
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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Maybe you can find something here
http://www.wanderlodgeownersgroup.com/downloads/ Its full of downloads and manuals. Over on the Wanderlodge owners group.
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04-22-2017, 07:49 AM
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#20
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Mini-Skoolie
Join Date: Apr 2017
Posts: 56
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Ok man, I get it. You're sticking up for you buddy and flooding my post pointlessly.
Can we get back on topic and not feel the need to be superior? Thanks.
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