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Harvey51's avatar
Harvey51
Explorer
Aug 19, 2020

Strange signal light problem when towing

Our class C often tows a utility trailer with 2 kayaks. Something happened to the wiring in the hitch area and I had to reconnect the wires from the trailer to the 4 wire plug. I must have made a mistake because using the right turns signal light now causes both left and right signal lights to flash on the MH and the driving lights on the sides and high up on the back.

When I use a different tow vehicle to pull the same trailer, everything works. Does this mean the problem is in the hitch wiring on the MH? I have a little 4 wire tester plug and it shows everything okay.
Class C
  • midnightsadie's avatar
    midnightsadie
    Explorer II
    Aug 19, 2020
    pull the ground off the trailer ,clean to bare metal bolt back on trailer. 995 of light problems start with a bad ground . grnd wire is white.
  • Jack_Spratt's avatar
    Jack_Spratt
    Explorer
    Aug 19, 2020
    midnightsadie wrote:
    pull the ground off the trailer ,clean to bare metal bolt back on trailer. 995 of light problems start with a bad ground . grnd wire is white.


    X2
  • Harvey51's avatar
    Harvey51
    Explorer
    Aug 20, 2020
    Got it working in an hour or so. Wiring diagrams and colour codes on the web were no help. What works . . .


    MH Utility Trailer function
    ----------------------------------
    white white ground
    brown green/black right signal ?
    yellow yellow left signal ?
    green dark green running lights
    brown/yellow N/C

    the trailer is from Home Depot

    The cause of the MH signal lights going rogue was, of course, one wire connected to another wire from the MH, because of colour code confusion. I have not yet tried using the trailer on the van where the problem didn't occur.

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