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Old 07-22-2017, 01:56 PM   #1
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
1-wire Alternator troubleshooting

I've been putting a bit of time into this long retired '97 BB Cat 3128 prospect. After I found a link one of you shared for manuals, I managed to find and free up the body power supply solenoid by taking it apart and giving it some attention. Now power is supplied to all that important stuff including wipers and running lights!

But it did not solve the charging issue. I'm looking at a couple things now, having read up on the forum and webs. It wasn't solved by cleaning connections and tapping at it yesterday eve when I was last at the bus. It has battery voltage. It has one, brown, wire on what I believe is the "i" terminal.

First, I guess I'll try checking the alternator bulb if its actually a two-wire set-up and possibly flashing the "R" wire on the alternator if it's indeed a one wire set-up.

The tach is intermittent and I suspect that it is the one other wire attached, not a lamp wire (although it is attached to the I, not R? terminal), and the alternator is simply yet to begin charging under it's own residual magnetism.

if I understand correctly, there is a bar that is severed if it is used as a 2 or three wire system, but I don't know where that is in order to check it. It has the plug overing 1 and 2. Here is a picture

Am I on the right track? Vern

P.S. I was reading about the alternators here

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Old 08-03-2017, 10:29 AM   #2
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
Acquired the bus. Think I fried something since I had some tach but now have none after trying to re-energize the field circuit and probably mistakenly jumpering to the 'I" terminal the first time.
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Old 08-03-2017, 12:36 PM   #3
Bus Crazy
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 1,097
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
I really have no advice but to take the alt off and either get it rebuilt entirely or replace with new.
Gremlins are one thing but if you made a mistake trying to flash it that gets costly. Take it to a pro and save a lot of aggravation. Or take it apart yourself and buy the parts necessary for the rebuild. At least you can learn something which you can then share down the road.
Parts don't last forever so...
Not knowing really what you did,I doubt any of us can correct it for you.
Good luck.

John
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Old 08-03-2017, 09:42 PM   #4
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
Thanks for the reply, John.

As luck would have it, I lost all power in run and start positions today after having cleaned instrument cluster connections. Initially things were much imporoved and reading voltage and fuel level more accurately. Seemed buzzers chimed up also. Until I went to start it and everything was gone. at first it came back to having power in the run position but then did nothing. In the accessory position I have maintained the solenoid 'clunk' and have limited use of the panel beyond which the solenoid starts 'hammering'.

I investigated battery grounds but will do so more thoroughly tomorrow. Both batteries were at 13+v. I wonder if there is a fuseable link at issue, perhaps. Any thoughts?

Also, one is supposed to jumper to the 'I' terminal on the Delco Remy 19si for that purpose. Pardon my mistake in the previous post.
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Old 08-04-2017, 03:08 AM   #5
Traveling
 
Join Date: Nov 2015
Location: Midwest
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Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
Just a thought, but how are your batteries setup? A pair of charged batts in parallel?

You didn't leave-out any pigtail battery connections?

If I suspect a bad ground, I'll throw a jumper cable from neg post on battery to alt bracket, etc to test.
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Old 08-04-2017, 04:29 PM   #6
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
Quote:
Originally Posted by Rusty View Post
Just a thought, but how are your batteries setup? A pair of charged batts in parallel?

You didn't leave-out any pigtail battery connections?

If I suspect a bad ground, I'll throw a jumper cable from neg post on battery to alt bracket, etc to test.
I have two well-charged batteries in parallel with each other. They have leads for a 24v fuel cut-off solenoid circuit. The configuration was working until I was cleaning up. Another thing I did was to disconnect the intake heater solenoid pigtail to cut down on battery drain while I was working with things 'hot'.

I tried using booster cables from the battery to the frame at the shock mounts after cleaning them up down to bare metal to no avail.
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Old 08-04-2017, 05:15 PM   #7
Bus Crazy
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
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Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Quote:
Originally Posted by splitsvillage View Post
I have two well-charged batteries in parallel with each other. They have leads for a 24v fuel cut-off solenoid circuit. The configuration was working until I was cleaning up. Another thing I did was to disconnect the intake heater solenoid pigtail to cut down on battery drain while I was working with things 'hot'.

I tried using booster cables from the battery to the frame at the shock mounts after cleaning them up down to bare metal to no avail.

You lost me somewhere. Is this on the 3116 or the 3208?
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Old 08-04-2017, 05:23 PM   #8
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
Quote:
Originally Posted by BlackJohn View Post
You lost me somewhere. Is this on the 3116 or the 3208?
3116. at first I thought it was the 26. Is this the same as yours? Do they not all have 24v fuel solenoids?
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Old 08-04-2017, 07:20 PM   #9
Bus Crazy
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 1,097
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Quote:
Originally Posted by splitsvillage View Post
3116. at first I thought it was the 26. Is this the same as yours? Do they not all have 24v fuel solenoids?
Ok thks, now you are making more sense to me.

Yes, mine is a 3116 also.GMC chassis

So my fuel solenoid is 12V and has two wires, one for each coil in it. One opens the fuel gate and the other holds it open after warming up I think.

My alt is a 2 wire though with only one cable back to the battery connection.

You might have a defective ign switch and or cleaning of the cables at the starter solenoid and the starter cable itself. They like shiney, clean metals or they act intermittently.Good connection will start mostly, bad connection, everything seems dead.

Did you drive that from Cape Breton up home? How far and how did that motor work? They are made for that country for sure.

John
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Old 08-07-2017, 05:05 PM   #10
Mini-Skoolie
 
Join Date: Jul 2017
Posts: 22
Year: 1997
Chassis: 274" P1428
Engine: Cat 3116
Rated Cap: 71
I've tried to reply twice now, John, and every time I hit post quick reply it has to log me in again and the whole message is lost. Damn if I'm not P.O.ed with this. I'm lucky not to have damaged my screen. Will try again later.
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