mackrmodel686st Posted December 30, 2024 Share Posted December 30, 2024 I posted over a week ago and got no responses, so I'll try again. 2015 mack pinnacle with the mp7 engine. When the key is turned to the run position nothing happens, when turned to the start position the dash turns on like the key is in the run position. When you let off the key everything turns back off. Thought that maybe the key switch was bad so we replaced it but still have the same problem. Has anyone run into this problem and could someone possibly point me in a direction to start looking. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/ Share on other sites More sharing options...
fjh Posted December 30, 2024 Share Posted December 30, 2024 Sorry no one has posted ! as its not that common of a compliant ! Just stab in the dark ! I would try a new ignition switch! Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/#findComment-565027 Share on other sites More sharing options...
Joey Mack Posted December 30, 2024 Share Posted December 30, 2024 Sounds like the wires in the plug are switched around. Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/#findComment-565028 Share on other sites More sharing options...
mackrmodel686st Posted December 30, 2024 Author Share Posted December 30, 2024 15 minutes ago, fjh said: Sorry no one has posted ! as its not that common of a compliant ! Just stab in the dark ! I would try a new ignition switch! We tried that already, problem still the same. Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/#findComment-565030 Share on other sites More sharing options...
Joey Mack Posted December 30, 2024 Share Posted December 30, 2024 Is there a gray wire on the key switch plug? That would be the ground Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/#findComment-565032 Share on other sites More sharing options...
fjh Posted December 31, 2024 Share Posted December 31, 2024 somthing that has come to mind that you might try is to check the ecu plug for oil these had oil push issues in the wiring harness!! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74917-2015-mack-pinnacle-no-crank-no-start/#findComment-565058 Share on other sites More sharing options...
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