 1974 1.8L not holding a charge, Causes other than alternator |
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| Robnxious |
 Dec 3 2016, 02:40 PM
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RobnxiousOne  Group: Members Posts: 184 Joined: 26-October 06 From: Sacramento Member No.: 7,097 Region Association: Northern California  |
I have tried digging in on this a bit on here searching, and have seen posts saying "make sure it's the alternator before replacing". Here is what I have found so far. When the battery has a full charge, the volt reading is 12.75, and when it's running, it's about 13.5 (I remember reading on here last night that the running voltage should be about 14.5 IIRC). Which tells me it SHOULD be the alternator (that and the fact that if I run it with lights on at night, it needs charging when I get home). Also, my battery charger has an alternator check function and it said it was bad.
But, I also did the old shade tree mechanic trick of disconnecting the negative battery connection when the car was running, and it didn't miss a beat, still idled strong. I do have an alternator that I bought (yeah I know, didn't see the threads saying "make sure it's the alternator before buying" until after I had ordered it), but seeing how this is a PITA job the first time, I am hoping I can get my new baby up and running easily. Any help is appreciated, and thanks in advance |
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| TheCabinetmaker |
Dec 3 2016, 03:48 PM
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I drive my car everyday Group: Members Posts: 8,336 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
No on the 14.5. I suggest a battery terminal cleaning. Including the negative cable to body post, and also the ground strap above the trans.
And Larry is right about disconnecting the cable while running. That's an old trick for an old generator. |
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| Robnxious |
Dec 3 2016, 03:53 PM
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RobnxiousOne Group: Members Posts: 184 Joined: 26-October 06 From: Sacramento Member No.: 7,097 Region Association: Northern California |
QUOTE(The Cabinetmaker @ Dec 3 2016, 01:48 PM)  No on the 14.5. I suggest a battery terminal cleaning. Including the negative cable to body post, and also the ground strap above the trans. And Larry is right about disconnecting the cable while running. That's an old trick for an old generator. Thanks, I sent him some stats re: his answer, feel free to add anything to that. The battery connectors are clean and pretty much new. I will clean the ground strap above the trans. I have the feeling that hasn't been done in eons |
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Posts in this topic
Robnxious 1974 1.8L not holding a charge Dec 3 2016, 02:40 PM
larryM
When the battery has a full charge, the volt read... Dec 3 2016, 03:24 PM
Robnxious normal alternator output is 13.8-14.2v - that wou... Dec 3 2016, 03:50 PM The Cabinetmaker Those readings are normal. If your battery its run... Dec 3 2016, 03:53 PM Frankvw Could this not just be a bad battery? Not charging... Dec 3 2016, 04:17 PM Robnxious
Could this not just be a bad battery? Not chargin... Dec 3 2016, 04:51 PM rhodyguy Don't forget the ground post forward and below... Dec 4 2016, 11:01 AM porschetub 13.8 is the norm,but I noticed my new regulator is... Dec 4 2016, 12:43 PM ottox914 I'd agree with checking all grounds, battery, ... Dec 4 2016, 04:50 PM pbanders Follow through the tests on this link, it's th... Dec 4 2016, 09:41 PM Root_Werks Others have asked it and I don't see the infor... Dec 5 2016, 02:42 PM Robnxious
Others have asked it and I don't see the info... Dec 6 2016, 08:27 AM The Cabinetmaker So, the battery only runs down when driving with t... Dec 6 2016, 11:17 AM |
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