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Old 07-31-2018, 07:40 PM   #1
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Question 2008 Tiffin Allegro Bay - possible blown battery disconnect solenoid

Hello ya'll

We have a 2008 allegro bay 37 QDB, purchased 2 years ago. It is currently hooked up to 50 amp. power supply. We have not had a problem until now. My husband is pretty good at fixing just about anything, but this has him !

We actually have 3 issues and I don't know if they are related or not. He doesn't think so, but as a nurse I know that you need to tell the whole story!

About 8 months ago the chasis batteries were dead, so he tried to jump them with the generator. The generator died and now only starts with the ignition key on. We then took a little vacation from life and we were gone up until a few days ago. While we were gone, his dad was starting the motorhome about every month. The last time it started was on June 19, 2018.

Upon our return home, David started troubleshooting and decided to first replace the chasis batteries because they were 5 years old (the guy who sold the batteries tested them and said they were still good, but had low amperage).
He tried starting the coach, but still nothing. All of the dash lights come on and no tran, ECU 0, ECU 128 shows on the digital readout, along with the yellow check engine light.

He then ran 12v to the starter solenoid and was able to start the coach that way. He then used the multimeter to test voltage from the ignition switch to the 5 amp ignition fuse and he had voltage. He is not getting voltage to the starter solenoid.

I have searched for wiring diagrams, but can't find it - most likely due to the fact that I do not know what the panel is called I also cannot find out the instructions on how to test the engine for error codes.

The 3rd issue is that when we turned on the ACs, the back AC has tripped the breaker once. The second time we turned it on it shut off itself (and the temp was set to 75, the room temp was 80) The front AC is working perfectly fine. He hasn't tested anything with the AC because we are stuck with the other two issues at the moment

Any and all help is greatly appreciated!
Thank you, in advance,
Michelle & David
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Old 07-31-2018, 10:15 PM   #2
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The A/C is distinctly separate from the 12-volt chassis and 12-volt house system. The thermostat, however, does employ 12v ... probably from the house batteries...but I would not link 12v to the 2nd A/C unit tripping a breaker and/or not running. I assume you are at a power-pole with 50-amp service. If so, the front A/C will be on a different leg of AC power than the rear A/C. I'd check the power pole to see if the plug there is failing / arcing / heating-up.


Good to know that you can jump-start the engine. As to why there is no ignition-key voltage making its way to the starter may not be an error but perhaps "engine protection". Ignition-paths have relays that will prevent the starting of the engine if something is wrong. Like: Water in the fuel-filter. Low coolant level in the cooling-system reservoir. Without a wiring diagram, this is a shot in the dark --- but try removing and then re-seating all relays you find in the control/fuse/relay board.
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Old 08-01-2018, 09:53 AM   #3
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Hi Michelle & David! Welcome to IRV2! We're sure glad you joined the gang!

You lost me waaay back! Sorry!

Good luck, happy trails, and God bless!
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Old 08-02-2018, 10:16 PM   #4
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Welcome to the forum!



We're sorry that it took such a problem for you to join us and we hope that you will stay engaged in the forum after you have a resolution.
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