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Headlight Issue on Ford

Discussion in 'Fisher Engineering Discussion' started by bdavis, Nov 7, 2009.

  1. bdavis

    bdavis Member
    Messages: 66

    I have an 03 F250....4 port isolation module,,,,installed today and only the pass side lowbeam light will work on the truck. If I switch the harnesses at the iso mod, port 3 and 4then only the driver's side lowbeam will work. Tried another iso mod...no luck. Also tried the jumpers on the #1 wire...no luck.....ANy help would be greatly appreciated.

  2. bdavis

    bdavis Member
    Messages: 66

    Got it....BAD ISO MODULE...now the jumper works...Thanks
  3. Raymond S.

    Raymond S. Senior Member
    Messages: 513

    make sure your connections at the iso module are good. My #3 plug has to be super tight for the driver side low beam to work. I actually have a wire tie around it to make sure it's tight.