Moparmike Posted November 1, 2018 Share Posted November 1, 2018 Ok guys truck had brake lights this morning now tonight none..no power to light switch on firewall..is there a relay in the cab or fuse..got dark on me so I didn't get to check alot of things like I wanna get to..all other lights work just no brake lights..thanks in advance Quote Link to comment https://www.bigmacktrucks.com/topic/54712-2000-rd688s-no-brake-lights/ Share on other sites More sharing options...
41chevy Posted November 1, 2018 Share Posted November 1, 2018 There is a fuse. 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/54712-2000-rd688s-no-brake-lights/#findComment-408779 Share on other sites More sharing options...
MACKS Posted November 1, 2018 Share Posted November 1, 2018 The light switch is probably in the cab,look over and around by he clutch pedal Quote Link to comment https://www.bigmacktrucks.com/topic/54712-2000-rd688s-no-brake-lights/#findComment-408786 Share on other sites More sharing options...
Moparmike Posted November 1, 2018 Author Share Posted November 1, 2018 Ok thanks ..I replaced the 2 on the firewall does the 1 inside look like the 2 I replaced..airline and 2 wires going to it.. Quote Link to comment https://www.bigmacktrucks.com/topic/54712-2000-rd688s-no-brake-lights/#findComment-408792 Share on other sites More sharing options...
Moparmike Posted November 3, 2018 Author Share Posted November 3, 2018 Ok guys I'm really at a lost here ..I've changed out the 2 on the firewall 1 in the cab still no power..anybody know the location of the fuse inside the cab..or relay that controls them..I still have no brake lights..no power on firewall when pressed or even when I start the truck for the first time to let air build..thanks Quote Link to comment https://www.bigmacktrucks.com/topic/54712-2000-rd688s-no-brake-lights/#findComment-408855 Share on other sites More sharing options...
Mack Technician Posted November 6, 2018 Share Posted November 6, 2018 (edited) You have a small, fused, power distribution mod on the firewall near steer column? Check the main power lead and wiring behind front housing of box for corrosion. Edited November 6, 2018 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/54712-2000-rd688s-no-brake-lights/#findComment-409010 Share on other sites More sharing options...
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