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Old 11-13-2023, 02:38 PM   #1
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 343
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
I lost main Hot to the Main relays in the Cabinet left of drivers seeat.

And as usual, I'm having a hell of a time trying to spot Feed in the Schematics.

You would think a 6 gauge or similar size wire would be really easy to spot . NOPE.

I started the bus. Everything looked good; got out to do a walk around while the brakes were topping off.

Got back into the drivers seat and found the Camera system down. And then found everything was down other then the dash.

NO power getting to the Main two relays in the left of drivers seat cabinet.

I cruised under the bus the full length looking for rat-chewed wires. Since, I found there is a fat rat making its home onboard at the moment. I can not spot any chewed wires anywhere.

And I cant spot the feeder path on the schematics. I am assuming the feed is from a Relay on the front panel

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Old 11-13-2023, 04:50 PM   #2
Bus Crazy
 
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Join Date: May 2015
Location: Central Tx.
Posts: 2,039
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Man, either that bus hates you or it's telling you LET"S GET ON THE ROAD ALREADY !!!

What exactly do you mean by this -> found everything was down other then the dash?

and this too -> NO power getting to the Main two relays in the left of drivers seat cabinet.

Bus starts? y-n

Transmission push pad lights up? y-n

Blinkers work? y-n

Headlights turn on? y-n

Interior lights turn on? y-n

wipers work? y-n

I ask all these questions because you have several sub circuits to consider here.

You have your basic "Chassis" circuit which is the starting circuit, like when the chassis is built and has no body and you have a "Body" circuit which has sub circuits.

If your bus starts and drives then we look at the body circuit.

If the whole body circuit is dead then I would first look to find a "Body" ground that might be missing.

If only certain body circuits are dead then you need to drill down to the sub circuit affected.


Are you using any of the wiring diagrams you have?

which one, please upload.

I'll try my best to help...

But once you fix it, don't ever turn it off again!!!

only kidding...
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Old 11-13-2023, 06:34 PM   #3
Bus Nut
 
Join Date: Jan 2023
Location: Carlsbad NM
Posts: 343
Year: 2002
Coachwork: Blue-Bird All American RE
Chassis: F204270
Engine: Cummins 8.3 ISC
It started and drove; the transmission was fine. Dash Gauges fine.
Anything part of the Body Relay is apparently... not working.

And as Usual, as much as I hate it. The outcome is. I swapped Relays for a spare. Which , upon metering, didn’t make a change.
Then I pulled the coupler from the First main relay... that did not have 12 v hot as it usually has on one leg. After I plugged the coupler back in. Everything was working again.
It makes no sense to me. The in Leg of the Heavy gauge wire has always had 12v. It didn’t. Now it does. So frustrating. Thanks for reaching out. And I still have not found the wire on the schematic for that Path which I am now sure is the Body relay, feeding the Panel Relay.
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Old 11-13-2023, 06:53 PM   #4
Bus Crazy
 
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Join Date: May 2015
Location: Central Tx.
Posts: 2,039
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by jfmusic@me.com View Post
It started and drove; the transmission was fine. Dash Gauges fine.
Anything part of the Body Relay is apparently... not working.

And as Usual, as much as I hate it. The outcome is. I swapped Relays for a spare. Which , upon metering, didnít make a change.
Then I pulled the coupler from the First main relay... that did not have 12 v hot as it usually has on one leg. After I plugged the coupler back in. Everything was working again.
It makes no sense to me. The in Leg of the Heavy gauge wire has always had 12v. It didnít. Now it does. So frustrating. Thanks for reaching out. And I still have not found the wire on the schematic for that Path which I am now sure is the Body relay, feeding the Panel Relay.
Bus is screaming...let's get on the road !!!

For testing, while connected, wiggle the harness on the coupler...if power flickers you just might have something as simple as a bad wire/crimp.

I would also consider buying some contact cleaner and cleaning out the connectors, maybe add some sort of sealant/dielectric grease to the connectors.
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Old 11-13-2023, 07:14 PM   #5
Skoolie
 
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Join Date: Jul 2023
Location: Tennessee
Posts: 105
Year: '05
Coachwork: IC
Chassis: RE300
Engine: DT466 HT
Rated Cap: 69
Quote:
Originally Posted by ewo1 View Post
If only certain body circuits are dead then you need to drill down to the sub circuit affected.

Are you using any of the wiring diagrams you have? which one, please upload.
I'll try my best to help...
I just want to pop in and recognize / remind you of how valuable of a resource you are here. I've seen SO many helpful posts from you regarding diagrams and helping people chase down issues they're having and issues they've created. Thanks for being such an awesome contributor.
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Old 11-13-2023, 07:52 PM   #6
Bus Crazy
 
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Join Date: May 2015
Location: Central Tx.
Posts: 2,039
Year: 1999
Chassis: Amtran / International
Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by nocoasty View Post
I just want to pop in and recognize / remind you of how valuable of a resource you are here. I've seen SO many helpful posts from you regarding diagrams and helping people chase down issues they're having and issues they've created. Thanks for being such an awesome contributor.
Hey, Thanks... I consider it paying it forward.

God only knows how many times I received help when I was down and out!

And to add to that note, I want to also shout out and thank the many others here who do the same.

I have learned lot's, troves of good helpful info here from others before me!

This is truly one friendly, helpful forum!

Except for you Cadillackid, you dont know squat!



ROFLMAO...only kidding...you dude have reached god status!

Hope you stick around alot longer...I got more to learn!!!
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