Vangessela Posted Monday at 12:10 PM Share Posted Monday at 12:10 PM We're trying to figure out why our 2015 Pinnacle wont start. We've got power from the battery to the starter, the cab lights up, and turning the key to the on position turns on the dash and you can hear the various relays/circuits cycling. We have also verified that the engine hours are showing in the trip info screen, which should mean the ECU is communicating with the truck. However, when we turn the key to the ignition position, nothing happens. The F7 fuse in the center dash is good, and we've tracked it down to Relay 36, where pin 85 is not getting power when we turn the key to the ignition position. At the same time, if we try to send 12 volts to the starter solenoid, we still cannot get the truck to turn over. Does anyone know where we should start? Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/ Share on other sites More sharing options...
Mackpro Posted Tuesday at 02:26 PM Share Posted Tuesday at 02:26 PM Pin 30 should have 12 volts with key on . This is looking into the fuse box with relay out Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583656 Share on other sites More sharing options...
Mackpro Posted Tuesday at 02:34 PM Share Posted Tuesday at 02:34 PM Check voltage on both side of fuse 7 with the key on. Dont use a test light. Use an actual meter. The wire coming out of fuse 7 is labeled F7A1. It actually goes out the firewall in the big 100+ pin pass through. It’s pin 68 . Then comes back into the fuse box on the top connector bottom pin Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583657 Share on other sites More sharing options...
Mackpro Posted Tuesday at 02:36 PM Share Posted Tuesday at 02:36 PM Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583658 Share on other sites More sharing options...
Mackpro Posted Tuesday at 02:38 PM Share Posted Tuesday at 02:38 PM Also relay 36 has to be installed correctly or it won’t start. Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583659 Share on other sites More sharing options...
Vangessela Posted Tuesday at 08:33 PM Author Share Posted Tuesday at 08:33 PM Thank you for responding. I've been using a test light instead of a volt meter, so I'll try the meter next, but can confirm that the fuse in F7 is good, and has power to it (via test light), but cannot confirm the voltage. We also have power to pin 30 as well, we just can't get power to pin 85. Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583673 Share on other sites More sharing options...
Joey Mack Posted Tuesday at 09:06 PM Share Posted Tuesday at 09:06 PM Your in good hands now that Mackpro is here.. and yes.... No Test Lights... DVOM only! Quote Link to comment https://www.bigmacktrucks.com/topic/75998-2015-mack-pinnacle-not-starting/#findComment-583677 Share on other sites More sharing options...
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