Dalton1 Posted May 8 Share Posted May 8 I'm working on a 09 GU713 that has no left rear turn signal. Everything else works fine, so far I've un hooked the wiring where the factory wiring goes to the dump body, has about 1v coming out of the harness at the rear of the truck. Truck had no turn signals at first but replaced the turn signal switch and updated the flasher per the service bulletin from Mack, that fixed everything but the left rear blinker. Haven't been able to find any wires damaged. Is there any common spots to look for on these? Does anyone have a wiring diagram for the lighting circuit? Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/74135-gu713-turn-signal-issue/ Share on other sites More sharing options...
Dalton1 Posted May 22 Author Share Posted May 22 Found a broken wire in about 2' down the harness from the back, no idea why, no damage to the wire wrap or any other wires. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74135-gu713-turn-signal-issue/#findComment-552337 Share on other sites More sharing options...
mechohaulic Posted May 23 Share Posted May 23 sure is nice when someone post a problem then has the thoughtfulness to post an update/ repair. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74135-gu713-turn-signal-issue/#findComment-552364 Share on other sites More sharing options...
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