Brake Lights
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Junior User
Joined: Feb 2010
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Brake Lights
I have a 89 f250 7.3 IDI, the brake lights arent working and im getting no power to the hazard/turn signals on the RH (passenger) side. all marker/parking lights are still working. Is there anything diesel specific to the light wiring on these trucks? I have a schematic of the wiring and am planning to go through all of it, was just wondering if anyone else has had this problem and could tell me where to start. Any help would be great, Thank you.
Postmaster
Joined: Apr 2008
Posts: 4,802
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Nothing diesel-specific to the lights wiring AFAIK. Check voltage at your BOO switch, it lives on the brake pedal and moves with it - one of the wires should be 12V constant, and the other should get 12V when you push down on the pedal, you will also likely hear the switch "click" when it engages and disengages.
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