0080gill Posted June 30, 2018 Share Posted June 30, 2018 Hi how are you all? I have mack 2003 cx613. I have brake light problem I have right tail light working fine same wire have brake and signal light on right working good...but left signal is working but no brake light.. I have 4 wires coming from front...back up light, 2nd right light with brake light. 3rd brake light with signal and 4th ground. so my left signal is working but not brake light check fuse is fine and brake switch is fine only found 1 and don't know where is the relay check firewall and fuse box and even pull dashout... if anything can help me would be great please 0080gill@gmail.com thanks Quote Link to comment https://www.bigmacktrucks.com/topic/53701-brake-light-need-help/ Share on other sites More sharing options...
mrgumby Posted June 30, 2018 Share Posted June 30, 2018 You could have a bad directional switch Quote Link to comment https://www.bigmacktrucks.com/topic/53701-brake-light-need-help/#findComment-401630 Share on other sites More sharing options...
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