Dhitman Posted September 12, 2018 Share Posted September 12, 2018 I have a 2015 Mack MP-8 that pops the fuse for the ignition key switch and the tractor shuts down abd will not start. I need a wiring schematic to diagnose what the problem is. Any info would be greatly appreciated. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/54253-ignition-system/ Share on other sites More sharing options...
41chevy Posted September 12, 2018 Share Posted September 12, 2018 Look at the connector on the back of the ignition switch, I've seen them over heat and short out. 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/54253-ignition-system/#findComment-405854 Share on other sites More sharing options...
turckster Posted September 13, 2018 Share Posted September 13, 2018 A common problem spot is the engine to chassis harness. I have seen them chafe on the harness support bracket mounted to the air compressor head and cause a short. There are a few other rub spots for that same harness in that area as well. Another possibility is the harness from the cab to the frame. If it is not properly secured there are tons of rub points for it also. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54253-ignition-system/#findComment-405928 Share on other sites More sharing options...
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