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Search results

  1. 9

    Brake light wire short

    I can jump Pin C in the Cannon plug to Pin F and get both brake light to illuminate , Jumpin Pin H gets all the running lights and tail lights to illuminate , Pin K still represents a shorted condition
  2. 9

    Brake light wire short

    Ok Thats starting to make more sense , Yes one wire from my brake switch runs up to Pin K on the PX15 plug , For some reason the wire lining up with Pin C On the plug is going to the dimmer rheostat for the dash lights ??
  3. 9

    Brake light wire short

    I have found where 2 wires go into the one connector that triggers terminal 86 on the K10 relay , I am not sure if this is where the 2 wires from the brake switch outputs come together or not I am assuming at least one of these wires is comming from Pin C in the PX15 plug but Im not sure where...
  4. 9

    Brake light wire short

    Ok So Forget everything I had just posted this morning lol . I started second guessing my findings and on a hunch I went back out to look at the harnesses once more , I was wrong on the output wires from the brake switches , The output with the 2 wires going into the ring loop I followed up...
  5. 9

    Brake light wire short

    I found an interesting condition this morning . So I have the PX15 plug disconnected from the light switch , I also have both legs disconnected from the brake pedal switches . I traced the wires comming from the brake switches up through the grommett into the dash one of the wires from the...
  6. 9

    Brake light wire short

    Yup thats what made me test it again , the lights were too bright to be marker lights . I switched back to jumping Pin C to get the running lights back on . Now since the K10 relay is removed jumping pin H does not illuminate brake lights anymore !
  7. 9

    Brake light wire short

    I did find something kind of interesting just a minute ago . I unplugged the PX15 plug from the lightswitch . I found a pinout diagram and used a jumper wire to test the individual circuits , I could get the headlights to illuminate , the clearence lights , reverse lights , dash lights ...
  8. 9

    Brake light wire short

    Both the trailer plugs and Intervehicle plug look great , I am going to have to see if I can get a good look at the back of them and their harness routes . This truck had rescently been reconditioned by Stewart and Stevenson in 2009 , Everything looks beautiful in condition. Could I have a...
  9. 9

    Brake light wire short

    I am now believing that this truck has had this problem for a long time and that the person I bought it from didn't notice it. One thing I do see is that they're is a green LED right above each relay and when they are in working order their illuminated. The brake light LED doors not light in...
  10. 9

    Brake light wire short

    So I'm thinking of connecting the 2 brake switch outputs directly and running it to the K10 relay and set if it turns the brake lights on ? Just bypass the whole circuit from the original harness for testing !
  11. 9

    Brake light wire short

    I had also tried jumping the 12 volt power directly to the stoplight wire with the PX15 plug removed and it still shorts ? I am not sure if that rules the switch out but I was curious while I had the dash panel loose
  12. 9

    Brake light wire short

    Ok So a Morning update ! With Relay K10 removed and Relay K9 removed which are Brake light and Hazzard the brake switch outputs are still resting ground and will still short the CD76 circuit breaker when the brake pedal is pushed ?
  13. 9

    Brake light wire short

    Hmmmm that's great info Thanks ! When I get out to the truck in the morning I'll check this out. I want to thank everyone who has helped out with ideas so far. I've been pulling my hair out lol
  14. 9

    Brake light wire short

    Ah ok so it is CB76 that trips. I pulled K10 relay out then tested the brake switch output wires and they still rest ground ? Not sure if they should have gone neutral or not ? One thing I did notice was that all of the relays in the circuit box are all 12 volt ?
  15. 9

    Brake light wire short

    I did unplug the turn signal stalk and the brake outputs remain grounded ? I took apart both taillight assemblies and their brand new , looked them over and their grounded well and the connections are very solid , I ran the hazards for quite a while and never got a circuit breaker to pop, same...
  16. 9

    Brake light wire short

    I've spent the day looking behind every accessible panel to track down this short in the brake wire ? There is no damage at all to any of the wiring in this truck . I can get power on the output side of the switches from the brakes , It sounds absurd but could I intercept the left and right...
  17. 9

    Brake light wire short

    I'll try that , At this moment both wires are resting ground . I think somewhere the main wires that go to the rear of the truck somehow connect with the brake light output , turn signal output, and the Hazzard flasher output . I'm looking at the schematic trying to locate this area ?
  18. 9

    Brake light wire short

    Hello !! I'll probably get the 3rd degree for this but I've searched all over for a resolve for this problem all over this site and I am all out of ideas ?? So I just purchased a 2001 M1083A1 FMTV . Its a rescent rebuild done in 2009 , so far everything on this truck is brand new , All of...
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