Diesel Bombers - Headlights dim in and out

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Geronimo Flores

07-10-2016 01:57 PM

Headlights dim in and out

Have a 97 Cummins swap over to a 89 gmc 3500 can't figure out why my light dim in and out ?

Tmaxxrox97

07-11-2016 10:22 AM

Do you have a voltage gauge?
The grid heater on the 12 valve motors pull 60+ amps and if it is cycling it will make your headlights/dash/voltage gauge dim. I would pull the fuse for the grid heater and see if it still does it and go from there.

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