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The running lights and brake lights circuits were both designed and installed by Ford. The E-350 chassis was used for a variety of vehicles, from cargo vans to RV and light utility trucks. The rear lighting will be the same schematic for these vehicles.
Schematics for these vehicles can be found in most public libraries, in technical or "shop"/repair manuals for almost every vehicle ever made. If your are not familiar with these manuals, ask a librarian for assistance in find the correct publication for a 1985 FORD E-350.
The RV manufacturer probably spliced into the Ford wiring for the rear lights on you vehicle. The fuses for both circuits should be under the hood.
If your brakes lights don't work, your cruise control should also stop functioning. The cruise control gets it's ground by being wired into the positive side of the brake lights. The ground is actually supplied across the filament of the brake light bulb. When power is supplied to the brake lights the cruise control loose it,s ground and stops working..
Get a manual from the library, and you should fix two problems at the same time.
Try the manufacturer first. Most have schematics you can download off the Internet or they will mail it ot you. No luck, google it. 90% of the time you can find one if you are persistent.
They do not exist. Forest River may build three of the same unit side by side at the exact time and everyone of them be wired differently. I worked for a dealership that sold Forest River products exclusively and it was a real night mare at times.
RV manufacturers do not publish wiring diagrams. You will need to determine if there are other lights on the same circuit. From there determine which light is the last light in the series prior to the failed fixture and trace back from there.
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