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fuse problem

Discussion in 'Chevy Trucks' started by turbo5560, Dec 24, 2007.

  1. turbo5560

    turbo5560 Senior Member
    Messages: 285

    So i had an aftermarket rear defrost put in my truck for obvious reasons and they installed the power to the trialer light fuse. I found that the defrost wasn't working today so i checked the fuse but it was still good. Got a test light on it and there is no power going to the fuse at all. Nor any of the other trailer related fuses... any ideas what went out? Possibly the trailer relay? any help? thanks!!!
     
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Exactly what fuse (what is it labeled exactly?)...and in which fuse panel is it tapped into?
     
  3. turbo5560

    turbo5560 Senior Member
    Messages: 285

    it says "TRL PRK 15A". And its in the fuse box underneath the hood. Not the one inside the truck on the floor. The truck is an 02 3/4 ton.
    thanks for any help!
     
  4. sparky8370

    sparky8370 Senior Member
    Messages: 234

    Did you check all the "big" fuses?
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Ok, the fuse you checked (TRL Park) and the ones marked:

    FRT PRK (10 amp)
    LR PRK (10 amp)
    RR PRK (10 amp)
    are all fed power from the park light relay....and the park relay gets it's power from a fuse in the panel marked "Park LPS".. it should be a 30 amp fuse..

    Do the park light on the truck work?
     
  6. turbo5560

    turbo5560 Senior Member
    Messages: 285

    correct, the parking lights don't work. so you are saying check the fuse marked "PARK LPS"?
     
  7. turbo5560

    turbo5560 Senior Member
    Messages: 285

    check the PARK LPS fuse and it was still good.....
     
  8. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If all the fuses are good then the next step is to see if the parking light relay is working. It's located in the relay/junction box under the dash near where your left foot would be. Pull the cover off... the park relay should be mounted near the center of the box (there not labled). You can try turning on the park lights to see if you can hear the relay click... but their pretty quiet so you may need to hold your finger on it and see if you can feel it click...

    I'd also double check all the fuses with a test light if you haven't already done it this way....don't forget to check both sides of the fuse too..
     
  9. turbo5560

    turbo5560 Senior Member
    Messages: 285

    i haven't had time to check it yet, but what if i do hear or feel the clicking? obvisoulsy replace it if i don't... but what if it seems to be working? thanks for all the help!
     
  10. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Then we'll have to dig deeper into the wiring to figure out why the relay isn't sending the power out to the park fuses in the under hood fuse panel...

    Why they connected the defroster to the park circuit is beyond me....that was a very poor choice as there's much better circuits to add accessories into in these trucks and the park circuits have enough draw on them to begin with..