Help w/ Flashing Lights on Peterbilt 387

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ahmadali04, Dec 18, 2013.

  1. ahmadali04

    ahmadali04 Bobtail Member

    28
    6
    Jan 30, 2011
    0
    I have an 07 Peterbilt 387, and the truck has an problem where the marker lights keep flashing On/Off. I heard a buzzing noise coming from the relay in the fuse box, and replaced the relay, and the new relay is making a buzzing sound as well and the lights are still flashing. I figured, maybe the light switch itself was bad, I replaced the switch in the dash, and the problem is still there. Any ideas on what could be causing this? Thanks.
     
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  3. morehp

    morehp Medium Load Member

    699
    205
    Jun 18, 2012
    0
    Usually a bad earth to the relay can cause this. Try and run a jumper earth to see if it goes away. I have seen the joints in peterbilt looms where individual earths come off break.
     
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