Cab clearance light issue

Discussion in 'Peterbilt Forum' started by Dallison, Jan 3, 2023.

  1. Dallison

    Dallison Light Load Member

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    Hey all, so couple days ago took off all 5 of my cab clearance lights and installed bullet style dual revolutions. I cut the connectors off old lights and soldered into new. I ran a wire for the color change but didn’t connect it to power. When I plugged in the lights nothing happened! Today I came out with multimeter and the plugs on truck harness aren’t getting power when I hit the marker light switch. Everything else works. I swapped around all the relays and cannot find a popped fuse. I am getting very frustrated because I won’t dare take a load across a scale house without functioning lights. What am I missing? What did I do wrong? 2007 379
     
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  3. RocketScott

    RocketScott Medium Load Member

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    Wiring diagram shows a connector on the firewall between the 'main cab roof harness' and the 'roof dash connect'. Yellow and white wires

    If all your other marker clearance lights work I'd check at that connector
     
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  4. Dallison

    Dallison Light Load Member

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    When I hear firewall I think of the engine bay side. Am I right? I’m stumped as to what I could have done between taking off working lights and installing the new ones other than possibly pulling on a wire when unhooking the old lights.
     
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  5. special-k

    special-k Road Train Member

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    Did you check for power at the switch?
     
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  6. FLHT

    FLHT Heavy Load Member

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    TRS lighting from Peterbilt ?
    Try wiring backwards...
    Aftermarket are wired backwards..
     
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  7. Dallison

    Dallison Light Load Member

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    I’m honestly not sure how, I know the connector going into the switch reads 12 volts. I moved that connector to a different switch and still getting no voltage at the wire ends but all other lights work ect….. basically no change after moving to different switch. I did notice the light on that switch is no longer illuminating
     
    Last edited: Jan 4, 2023
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  8. Dallison

    Dallison Light Load Member

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    Trux aftermarket lighting. I think I wired it right, I hooked the wires to a batttery just to make sure I didn’t have them mixed up
     
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  9. Dallison

    Dallison Light Load Member

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    I’m about to have to start digging through wires and looking for a short, but it baffles me as to what I could have done to mess up the wiring and it not be getting power but every other wire up there getting power- old lights worked fine, unhooked them and plugged in new ones.
     
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  10. RocketScott

    RocketScott Medium Load Member

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    I don't know where it is exactly, that's just how the wiring diagram is labeled

    If you've got power at the switch I'd check behind the overhead console, you probably just pulled that connector apart
     
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  11. Dallison

    Dallison Light Load Member

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    Apr 1, 2021
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    trouble is, I never put overhead console back up because I didn’t wanna button her up till everything was in working order. Currently none of them are hooked up because I’ve been probing every connection seeing where I have power and where I don’t.
     
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