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Sandor posted an update
Is there such a thing as a electrical trouble shooting manual for a 1991 Marathon XL Coach No 9156 XL June 1990.
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Not really. Feel free to ask questions and explain your issue, maybe someone has experienced that before and come up with a solution.
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I am having a problem with turn signals. Turn them on either left or right turn they may work for a little while along with the hazards and for no reason just stop. they after a while will start working again. Cant seen to find the flasher either. any help is appreciated.
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Did you try to replace the relays? There is one under the dash and one in the back box above the engine
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@prevostnewbie Mike, Thank you for your help. There is a relay in the back box, however by the time I get to the back to see which relay is the problem it stops working and won’t work for a while. the relays in the front driver side box is actually a double relay set up and it does not look like original to the coach. I was hoping to find a wiring diagram to assist in tracking it down. Thanks again.
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Your bus is very close to mine in vintage, when I get home I will snap a couple pictures of what I am talking about. There is a flasher module and 2 relays you need to locate. I would replace all 3 and keep them as spares. Early in my bus ownership I had a problem like yours, my turns/hazards wouldn’t work while traveling in 90 degree weather. I replaced all 3 and the problem went away. The front relay and flasher module is up under the dash next to the steering column, the back relay is in that box above the engine.
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@prevostnewbie Mike, Thanks I think you are on the right track. I have a complete binder on the bus however the electrical section is not in there. I will follow your advice, this problem existed when I purchased the coach. What is suspicious to me is the two relays wired in that have power as long the turn signal work along with the hazard switch, and all goes dormant when it all stops working. Thanks
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