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Dhitman

Ignition system

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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

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Look at the connector on the back of the ignition switch, I've seen them over heat and short out.

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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. 

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