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Ground hooked to 12volt help !

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Old Apr 8, 2017 | 08:52 PM
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Default Ground hooked to 12volt help !

Hi guys I was dropping in a new motor in my c6 , and somewhere along the way we hooked ground wire 106 to the big post on the starter side . The car went to get fired fuel pump primed and battery was dead . So then new battery out in . Hit the start button fuel pump primed starter did not start because when power went through the starter solonid it back fed that ground . The ground was put pack onto the block . No fuses or relays were blown . When I tried to start it hooked up the correct way the dash goes black when the start button is relaed the dash lights come back on . Hooked up the scanner and it says uo100 lost communication with pcm/ecm a ? Just wondering what my next step is or it anyone has done the same ,? Thanks
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Old Apr 10, 2017 | 10:24 PM
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im just guessing but the computer may need to be reflashed to previous setup
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Old Apr 11, 2017 | 06:37 PM
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Old Apr 11, 2017 | 09:18 PM
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I'd try leaving the battery unhooked for a while then trying again. If not, you probably have a bad ECM, did you check the ECM fuse in passenger side compartment?
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Old Apr 11, 2017 | 09:20 PM
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Originally Posted by BrownVette
I'd try leaving the battery unhooked for a while then trying again. If not, you probably have a bad ECM, did you check the ECM fuse in passenger side compartment?
Ya all fuses are good we put a meter on the harness that goes to the computer it has power and ground .
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Old Apr 11, 2017 | 10:41 PM
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[QUOTE=corvetteoshawa;1594508825]Ya all fuses are good we put a meter on the harness that goes to the computer it has power and ground .[/QUOTE
check to make sure both (+) are hooked up to starter, one from alternator and one from battery. And make sure the purple wire is hooked up to starter too
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Old Apr 12, 2017 | 07:00 AM
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