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  • 1990 Marathon lighting schematics

    Posted by Robert on April 12, 2026 at 1:19 pm

    My name is Bob I just bought a 1990 Marathon XL40 in Nov of 2025. Which lucky me does not have any info from the Marathon side. Not having the road map I am not getting anywhere fast. I am having a few issues on:

    1) my dock lights came on and I can not shut them off. I have shut breaker off. I also unplugged the push button board and still they stay on

    2) a couple of buttons for turning lights on are not doing a thing. Since you can turn on and off at various location in the coach. I am lost for not knowing where the circuits run.

    Any suggestion on where I could possible get info on schematics or a couple of kind words from anyone with knowledge of. To point me in right direction.

    Robert replied 4 months, 1 week ago 2 Members · 3 Replies
  • 3 Replies
  • Alex

    Member
    April 13, 2026 at 12:05 am

    Hello Rob,

    I am not familiar with that vintage, but Are you sure your docking lights are on the Marathon side and not the Prevost side. On my 2001 H they are on the bus side. Did you check the Prevost web site to see if they still list your bus and associated schematics, and have you reached out to Marathon up in Oregon. They have always been extremely helpful in tracking down electrical issues with me for my coach.

    Alex

    • Robert

      Member
      April 13, 2026 at 7:36 am

      Thanks for such a fast response Alex. Yes it is on the Prevost side but the switches are on the Marathon side. There is not a paddle switch on RHS counsel. There are two seperate single push buttons above driver in a Marathon circuit. At first I thought the buttons were stuck so I unplugged the connectors from the switch ( already shut breaker off w/no luck) still on. Are the wire numbers attached to it were Marathons. I call marathon to get a copy of the schematics. I was told they did not save anything that old. That’s a big bummer, I would think a company like that would have the records to every coach they built. This makes for more of a challenge.

      The Prevost side says it’s wired through their switch that is not there. You know maybe I need to take the RH dash plate off and see if Marathon taped it there. Once found it will be fixed.

      Today I have the pleasure to install my new Radiator and fan blade

      Bob

  • Robert

    Member
    April 15, 2026 at 11:21 am

    Thanks Alex for the response. They are on the Prevost side. I do have the Prevost schematics. On the Marathon side above driver are the two push buttons with two illumin

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