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Old 10-08-2012, 02:23 PM
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Default Electrical - Alternator or short?

1964 ELCO - 350 with alternator. Dead battery - had auto parts store charge and chcek battery - battery is ok. reinstalled and started up - store put test equipment on it - said bad vltage regulator -- there is no voltage regulator -- has an alternator. ALternator is working because when you pull negative cable off battery with engine running -- engine continues to run fine w/o battery - so must be making a charge ---
Any ideas of where to look or do i have a bad alternator? -----
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Old 10-08-2012, 02:56 PM
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The alternator that was on my 66 used a voltage regulator, I thought the earlier ones did so I never gave it any thought. New setup doesn't, it is internal.
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Old 10-08-2012, 03:46 PM
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one of the guys there said the same about voltage regulator with the alternator. The test equipment said bad voltage regulator and the book in the shop had one for a 64 for $38. But my car has a later model 350 in it. Looked all over the car - could not find a voltage regulator or any box that looked at all like the one described in shop manual. I know --- trace the wires but did not find a box under hood or dash - even looked or felt inside wheel wells.
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Old 10-08-2012, 04:02 PM
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even late model alternators have voltage regulators built inside them, a lot of times a GOOD gm alternator(charges fine) will get "stuck" causing a slow drain, take a test light, remove the ground cable, hook the test light between the ground post and the ground cable, does the light come on? if so something is draining the batt. next unhook the alternator(completely, even the charge wire) and check it again. did the light go out? if so you need an alternator. if not, start by pulling fuses one at a time and check the test light after each.when the test light goes out, you have found your drain.

Last edited by Skandolis; 10-08-2012 at 04:07 PM.
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Old 10-08-2012, 04:05 PM
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The motor will run as long as there is 12 volts. It will run till the batt. goes dead. The voltage reg. is inside the alt. case.
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Old 10-08-2012, 04:06 PM
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thanks - will give it a shot tonight ---
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Old 10-08-2012, 04:10 PM
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car runs all day after a jump start - so assume alternator is producing juice. When i first had dead battery - jump started car - drove/ran it for 30 minutes to "charge" battery - turned off car, tried to start - dead. removed battery - took it to shop, sharged and tested good. so it appears alternator is producing juice since car runs on it - also removed ground cable to batttery while idling - which if running on battery should have killed motor - but ran fine I assume on alternator.
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Old 10-08-2012, 04:22 PM
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..Normally,there located on the rad.core support look on both sides,if not,then check the wires on the starter,there should be two red wires,one from the battery and one from the alt. Note; the wire coming from the alt. should have a fusible link in it down by the starter soloide..a quick test is to see if your getting power through the Alt. wire...another thing I forgot to ask,what does your alt. looks like..??

..This is the original one that comes on the year of your cruck...





...This is the one I think you have on your Cruck...





..if you have this type of alt. ckeck the Jumper wire between the Batt. and Pos.2 on the alt. hope this work for ya and good luck.
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