Zachman15 Posted November 8, 2020 Share Posted November 8, 2020 Hello everybody I have a 2003 Mack rd688s and the issue I am having is the back up light on the dash board comes on when hitting the brakes rewired the back of the truck and still does it any help would be greatly appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/64853-mack-rd688s-2003/ Share on other sites More sharing options...
0 41chevy Posted November 8, 2020 Share Posted November 8, 2020 Generaly that is caused feed back. A poor ground (which causes high resistance) with cause the power to find and easier was to ground the circuit. Generally through indicator lights. I would start by pulling the stop light bulbs one at a time. Try the brake and if the back up light on he dash light, move on to the next light. one will end the feed back. Than start at it socket , ground and even see if the bulbs filaments are touching. No issues move on to the directional lights front and back, the brake light circuits do feed through the brake light switch and the turn signals. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/64853-mack-rd688s-2003/#findComment-463618 Share on other sites More sharing options...
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Zachman15
Hello everybody I have a 2003 Mack rd688s and the issue I am having is the back up light on the dash board comes on when hitting the brakes rewired the back of the truck and still does it any help would be greatly appreciated
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