charlytrucking Posted February 7, 2018 Share Posted February 7, 2018 can anyone tell me how to fix this problem on my mack granite gu713 2008 my backup alarm and lights and the letter R on my dashboard don't work I replace de switch but still don't work I check the plug and don't have the 12volts power I check all my fuses and seem all good but I don't know wich fuse it is for backup alarm or it has a relay ????? what else can I check tanks Quote Link to comment https://www.bigmacktrucks.com/topic/52442-backup-alarm-and-lights-dont-work/ Share on other sites More sharing options...
Joshzinsky Posted February 10, 2018 Share Posted February 10, 2018 Should be a reverse relay Quote Link to comment https://www.bigmacktrucks.com/topic/52442-backup-alarm-and-lights-dont-work/#findComment-391661 Share on other sites More sharing options...
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