2006 9400 no panel lights or marker lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by selftaughttrucker, Feb 3, 2023.

  1. selftaughttrucker

    selftaughttrucker Bobtail Member

    May 21, 2015
    Baltimore, md
    Hello, first thanks for any advice I may receive. It’s been a while.

    This is weird. The marker lights and inside dash lights stop working.
    All the fuses marked for light are good but I just notice that the heater control module fuse is blown and when I reset the fuse the lights come back on then the fuse blow again.
    What could be the problem?
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  3. Heavyd

    Heavyd Road Train Member

    Feb 4, 2009
    Those lights are protected by breakers F3-C (30 amp) and F8-C (15 amp). F9-D is the breaker for the heater control module which is the temp control panel for the sleeper. This is only rated for 10 amps. If F9-D is supplying power to the lights, then someone has tapped into it by mistake or because they didn't know better, but I would say it is something like this and the wiring needs to be traced to see why and then fixed.
    blairandgretchen Thanks this.
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