Electrical starting system shutdown-could be nuclear meltdown - ZR-1 Net Registry Forums

Dave2 · 04-11-2013

Further data:

Old trickle charger dead-no output though charge indicator is green

Purchase new trickle charger

Data from vehicle:

fuse keyoff key on* *new trickle charger connected
LCD 13.1v 12.6v
ECM 0v 12.7v
CCM 0v 12.5v

Data matches normal power side of CCM (service manual section 8A-50.8)
Looks like next step is get into the dash to check ground side resistance thru harness to ground. I contacted http://gmautocomputers.com/ who rebuilds the CCM and ECM's for their experience. I described my symptoms to the gentleman and he indicated it fit a CCM failure, and these units are susceptible to power spikes (16v+). (Avoid jumping vehicle with a battery booster). Possible power spike from old charger that failed took CCM with it since CCM is always powered up. Rebuilt cost $280, current 10 day turn around time. I'm still hoping for a ground side issue (get out of jail free card- though it's feeling more and more like a Hail Mary pass).

04-11-2013	#12
Dave2 Join Date: Apr 2013 Location: Connecticut Posts: 10	Re: Electrical starting system shutdown-could be nuclear meltdown Further data: Old trickle charger dead-no output though charge indicator is green Purchase new trickle charger Data from vehicle: fuse keyoff key on* *new trickle charger connected LCD 13.1v 12.6v ECM 0v 12.7v CCM 0v 12.5v Data matches normal power side of CCM (service manual section 8A-50.8) Looks like next step is get into the dash to check ground side resistance thru harness to ground. I contacted http://gmautocomputers.com/ who rebuilds the CCM and ECM's for their experience. I described my symptoms to the gentleman and he indicated it fit a CCM failure, and these units are susceptible to power spikes (16v+). (Avoid jumping vehicle with a battery booster). Possible power spike from old charger that failed took CCM with it since CCM is always powered up. Rebuilt cost $280, current 10 day turn around time. I'm still hoping for a ground side issue (get out of jail free card- though it's feeling more and more like a Hail Mary pass).