2000 mack rd688s

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by earthmover, Nov 4, 2018.

Nov 4, 2018 #1

earthmover Medium Load Member

563

20

Jan 27, 2009

castalia , north carolina

0

Brake lights stop working..I've change the 2 switches on the firewall still nothing..can anybody guide me to a fuse or relay I'm lost and need this truck running...no power at switch

earthmover, Nov 4, 2018

earthmover, Nov 4, 2018

#1
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Nov 6, 2018 #2

Brettj3876 Road Train Member

11,257

54,039

Nov 18, 2014

Land of local

0

Mack should have a pdf somewhere you can look at. Give your dealer a call and see if they can point you in the right direction. Macks are known for shoddy grounds. Don't just by pass a fuse and wire it hot. Bad idea

Brettj3876, Nov 6, 2018

Brettj3876, Nov 6, 2018

#2
Nov 3, 2023 #3

PSakry Bobtail Member

6

0

Nov 3, 2023

0

Use a wire tracer... connect at the switch and chase it down!

PSakry, Nov 3, 2023

PSakry, Nov 3, 2023

#3