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Cab clearance light issue

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

Page 2 of 4
  1. Jan 4, 2023 #11
    Dallison

    Dallison Light Load Member

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    I will definitely look for that connection at firewall, I had read about it before and was gonna check yesterday but ran outta daylight
     
    Dallison, Jan 4, 2023
    Dallison, Jan 4, 2023
    #11
    Oxbow Thanks this.
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  3. Jan 4, 2023 #12
    Last Call

    Last Call Road Train Member

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    How are you checking for power ..with a test loght or a multi meter
    And what are you using for ground . ? Are you grounding each light seperatly ? or using 1 common ground for all the lights ?
    I just fought the exact same issue on a 07 ..379 after alot swearing & testingit end up being a spade connection in the planel that the relay plugs into
     
    Last Call, Jan 4, 2023
    Last Call, Jan 4, 2023
    #12
    Oxbow Thanks this.
  4. Jan 4, 2023 #13
    Dallison

    Dallison Light Load Member

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    I am using a multimeter, at the light plug I was probing the pos and neg of the plugs themselves. I guess the same for everything I tested, I just probed the neg and pos on the connector to the switch(I’m still a little confused on). Relays I just plugged in different ones and swapped them all around with all the lights on, not sure how to test those with multimeter. In your case was this after an install or did the lights just stop working one day?
     
    Dallison, Jan 4, 2023
    Dallison, Jan 4, 2023
    #13
    Oxbow Thanks this.
  5. Jan 4, 2023 #14
    Last Call

    Last Call Road Train Member

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    In my deal when I got the truck the previous owner had replaced the OEM roof lighrs with those stupid penny lights .. and the did not work so I tried to diagnose the problem before I replaced them.. but this truck had been hack up in the cab & engine wiring harness when I bought it so with the amount of extra lights the tard had added in the cab it cause alot of issues ..
    I will tell you this .. a 2006.5 & 07 ...379 have a different wiring Schematic than pervious 379s and I started a thread .. I think it was in this fourm asking where the relay for the cab roof lights was located .. so if you find that it thread.it should help you.. I honestly can't remember the memember that posted the info but it helped me out alot .. I started that thread like 30 days or so ago
     
    Last edited by a moderator: Jan 4, 2023
    Last Call, Jan 4, 2023
    Last Call, Jan 4, 2023
    #14
    Oxbow Thanks this.
  7. Jan 4, 2023 #15
    Dallison

    Dallison Light Load Member

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    oh ok cool! I’m sure that’s where I must have saw the info lol. It looks like hell to try and pull the panel to look under and with my lights working before I didn’t want to believe that the issue could be there but I’m definitely gonna look at it today. In your opinion, how should I go about testing things with my multimeter? Appreciate you!
     
    Dallison, Jan 4, 2023
    Dallison, Jan 4, 2023
    #15
    Oxbow Thanks this.
  8. Jan 4, 2023 #16
    Last Call

    Last Call Road Train Member

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    That panel under the overhead consel it's not to bad there is a brace right in the middle for the overhead lights you have to deal with but all in all its not bad
     
    Last Call, Jan 4, 2023
    Last Call, Jan 4, 2023
    #16
    Oxbow Thanks this.
  9. Jan 4, 2023 #17
    Dallison

    Dallison Light Load Member

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    Ok now I’m confused lol. I was talking about the relay panel
     
    Dallison, Jan 4, 2023
    Dallison, Jan 4, 2023
    #17
    Oxbow Thanks this.
  10. Jan 4, 2023 #18
    Last Call

    Last Call Road Train Member

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    Iam bad I somehow thought you were talking abput the overhead Cousel.. sorry
     
    Last Call, Jan 4, 2023
    Last Call, Jan 4, 2023
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  11. Jan 4, 2023 #19
    Dallison

    Dallison Light Load Member

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    No worries, thanks for your help!
     
    Dallison, Jan 4, 2023
    Dallison, Jan 4, 2023
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    Oxbow Thanks this.
  12. Jan 4, 2023 #20
    FLHT

    FLHT Road Train Member

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    Might be easier to just rewire the dam thing ..
    At least the cab lights in series and their own ground
    One wire down the door post ( left side ) comes out right at the light switch ?
    Mine is an early 06 Old dash with toggle switches.
    Rockers may be a bit different on new dash.
     
    FLHT, Jan 4, 2023
    FLHT, Jan 4, 2023
    #20
    Oxbow Thanks this.
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