What could be the issue? 3 alternators and all have the same issue, charge for 5 minutes after start up at 14.7, before gradually decreasing to 12.8! My previous battery was killed by this, now my new battery looks like it will have the same fate if I don't fix this!
I understand the alternator voltage regulator is in the alternator itself but why wont my car excite the alt to keep it charging? My new battery has gone from 13.0v float to 12.5 in a week. Also I have upgraded to a mechman alt and it hasthe same issue!
Someone correct me if I'm wrong...but doesn't the voltage demand come from the ECM/PCM? I know the regulator is in the alternator, but I thought it was controlled through the ECM still. Could be wrong though. At any rate, I would try cleaning all the related grounds and make sure they are tight. Trace all the wires coming from the alternator as best as possible, making sure there are no breaks or loose connections.
Reubenswinks thanks, that's what I was afraid of. Do you think jumping the alternator plug would excite the alternator 24/7? Maybe leaving it in there for a day to charge the new batt to keep it from discharging?
I would not do that. I have no idea what voltages those alternators are capable of when not regulated. You stand the chance of over charging or damaging electronics. As a temporary solution I would buy a battery tender and plug it in every night.
What could be the issue? 3 alternators and all have the same issue, charge for 5 minutes after start up at 14.7, before gradually decreasing to 12.8! My previous battery was killed by this, now my new battery looks like it will have the same fate if I don't fix this!
After new battery went in no sluggish start, before it would. It was an agm battery too.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Impala Forums
784.4K posts
61.7K members
Since 2007
A forum community dedicated to Chevy Impala owners and enthusiasts. Come join the discussion about performance, SS models, modifications, classifieds, troubleshooting, maintenance, and more!