mackrmodel686st Posted October 4, 2017 Share Posted October 4, 2017 I have a 1999 ch613 Mack with an e7 427 engine that keeps blowing the fuse for the ecu when I turn the key to the run position before I even start it. I'm sure it's a short somewhere, but I don't know where to start looking. Could anyone help me? Quote Link to comment https://www.bigmacktrucks.com/topic/51274-ecu-fuse-keeps-blowing/ Share on other sites More sharing options...
Mackpro Posted October 5, 2017 Share Posted October 5, 2017 Unplug the ecm , then install new fuse to rule out bad ecm Quote Link to comment https://www.bigmacktrucks.com/topic/51274-ecu-fuse-keeps-blowing/#findComment-381718 Share on other sites More sharing options...
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