High voltage from alternator - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

 
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post #1 of 9 (permalink) Old 09-29-2015, 08:33 PM Thread Starter
 
 
Join Date: Sep 2015
Location: Phillipsburg, nj
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High voltage from alternator

Need some help, any advice is greatly appreciated. On my 64 Impala convertible with a 327 has a over charging issue & cooking the battery. It's putting little over 16v at the battery & 18v at the alternator. I checked my grounds, it has a new alternator, new regulator, & new battery but the voltage is still over 16v. Is there something I'm missing?
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post #2 of 9 (permalink) Old 09-29-2015, 09:42 PM
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My question would be when did this problem start, with an overcharging problem or something else. What part did you change first. My gut feeling is that it's a faulty voltage regulator. Not sure what you mean by an amp. If it's an ammeter I would get rid of it and get a volt meter, much safer. Should be able to get your alternator checked at automotive supply store like Napa or etc. If that's good move on to next part.
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post #3 of 9 (permalink) Old 09-29-2015, 10:09 PM Thread Starter
 
 
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This problem seem to pop up after the ignition coil & resistor was replaced, I did replace the voltage regulator & alternator twice with no change in voltage, made sure the grounds were clean & tight. So there might be something else affecting the voltage output?
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post #4 of 9 (permalink) Old 09-29-2015, 10:16 PM
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Check your wiring harness from your regulator to the alternator. Look for broken wire or bad connection.
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post #5 of 9 (permalink) Old 09-29-2015, 10:25 PM Thread Starter
 
 
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Will do, just took a look at the wiring diagram & it seems fairly simple. I'm going to start checking the harness. Thx for the tip, I'll keep u posted.
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post #6 of 9 (permalink) Old 09-30-2015, 07:17 AM
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Fix it before driving it as that overcharge can blow the battery up causing lots of damage.
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post #7 of 9 (permalink) Old 09-30-2015, 09:38 AM
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It could be a bad alternator.
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post #8 of 9 (permalink) Old 09-30-2015, 05:47 PM
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Easiest and best is to convert it to an internally regulated alternator.
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post #9 of 9 (permalink) Old 09-30-2015, 08:38 PM Thread Starter
 
 
Join Date: Sep 2015
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Ok, figured it out. For some reason the ground from the regulator to the radiator shroud wasn't good. I ran a new ground directly from the alternator to regulator & got 14v at the battery. Thx for all the help....
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