Voltage drop. - Chevy Impala SS Forum
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post #1 of 4 (permalink) Old 09-05-2019, 03:59 PM Thread Starter
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Location: Western Massachusetts
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Voltage drop.

Recently, the alternator was not charging the battery well. Performed voltage drop test with a battery load tester connected to the alternator. Wow... 0.95 v on the negative side (and 0.16 v on the positive one). Sure, it would not charge!
I am wondering if a nice jumper from battery negative terminal to the alternator ground will do for now (until I have the time to redo all negative side with cables, connections, grounds).

Thereís nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 126,XXX miles.
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post #2 of 4 (permalink) Old 09-05-2019, 04:47 PM
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It certainly won't hurt anything.
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post #3 of 4 (permalink) Old 09-05-2019, 06:16 PM
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I seem to remember something like the "Big 3 upgrade" which consisted of adding additional Ground wires. Not sure if this is 1 of those wires.

I would at first consider new battery cables like those from Gary at Innovative Wiring or at least new stock AND definitely remove ALL Ground wires, clean the connection point and then reattach using dielectric grease. Cleaning the grounds can often fix a lot of electrical gremlins on these 25 YO cars. Don't forget the grounds behind both lower kick panels.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #4 of 4 (permalink) Old 09-05-2019, 09:25 PM
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Make the grounds good, then coat them with dielectric grease. The dielectric grease is a non-conductor, and can cause a ground fault.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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