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Old 01-25-2023, 10:20 PM   #1
Join Date: Jul 2022
Posts: 30
Transmission Allison AT542

I have an Allison AT542 transmission in my 92 Itasca.

Would anybody have an electrical schematic?

I need to trouble shoot my backup lights, all my fuses are good. but I'm not sure where the relay and the actual switch on the transmission are located.

Not sure if it could be related, but my cruise control is not working either, there is no power on the brake pressure switch up by the master cylinder.
I have service records of it being repaired just before I bought it, along with a receipt for a new vacuum pump.
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Old 01-28-2023, 01:39 AM   #2
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Join Date: May 2022
Location: San Francisco Bay Area
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I believe that FMCA has one or more Winnebago chapters (clubs) and there may be other owner's clubs. By contacting them you might get lucky. I have looked on-line for schematic diagrams for class A motorhomes that we have had. I have never found one that matches my coach even though the information says it does. However, generally speaking, you might glean sufficient information to be of help. Probably the best bet is to find an RV repair facility that has been in business for a long time and known to be competent. Dealers and Camping World will probably not have people with the knowledge and skills that you need.
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