Gigs Posted December 13, 2017 Share Posted December 13, 2017 (edited) Hi, I have a 2006 mack Mr with le motor. Truck runs good after 8 or 9 hours check engine light comes on. Truck still runs good but once we shut it down it won't restart until trucks sits for a couple hours then restarts like nothing ever happened until it repeats itself after 8 or 9 hours. Took the truck to mack wth light on and they Said it was reading active alternator but that it couldn't be the case cause truck wouldn't start at all.. seems like computer needs to reset itself before it starts up again. Thanks Edited December 13, 2017 by Gigs Quote Link to comment https://www.bigmacktrucks.com/topic/51954-mack-mr-check-engine-light/ Share on other sites More sharing options...
Mackpro Posted December 14, 2017 Share Posted December 14, 2017 (edited) Only thing I can think of is one of the power relays is not powering down. Try pulling the battery cables off, waiting a few minutes then putting them back on and try starting again. Also, you mean it will crank over but not start or just not crank over at all? Edited December 14, 2017 by Mackpro Quote Link to comment https://www.bigmacktrucks.com/topic/51954-mack-mr-check-engine-light/#findComment-387413 Share on other sites More sharing options...
Gigs Posted December 14, 2017 Author Share Posted December 14, 2017 (edited) No. It won't crank over. Dead all together. Lights will go on but nything else.. I won't get anything out of it til it sits for a while.. I use the kill switch off n on and truck stl won't start up or crank over. Is there anyway to reset computer to see if that works? Edited December 14, 2017 by Gigs Quote Link to comment https://www.bigmacktrucks.com/topic/51954-mack-mr-check-engine-light/#findComment-387445 Share on other sites More sharing options...
Mackpro Posted December 14, 2017 Share Posted December 14, 2017 Does it have a Allison trans? Quote Link to comment https://www.bigmacktrucks.com/topic/51954-mack-mr-check-engine-light/#findComment-387448 Share on other sites More sharing options...
Gigs Posted December 14, 2017 Author Share Posted December 14, 2017 Yes. Allison automatic Quote Link to comment https://www.bigmacktrucks.com/topic/51954-mack-mr-check-engine-light/#findComment-387450 Share on other sites More sharing options...
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