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Old 04-12-2003, 01:00 PM
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Angry Alternator frying

70 chevy nova, 350, externally regulated altenator, no shorts. Now the problem is that my battery is staying charged just fine, but the altenator battery terminal keeps heating up so bad that it melts the plastic ring around the post, and the post becomes loose in the alternator casing. What could be causing this? I've changed the altenator twice, and the voltage regulator once. I'm stumped.....I have a ground strap from the altenator ground post to the block and the battery is grounded to the block. Help. <img src="graemlins/crash.gif" border="0" alt="[crash]" />

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Old 04-13-2003, 08:51 PM
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You should also have ground straps from the motor to the firewall and the motor to the frame.

Joe
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Old 04-14-2003, 09:43 AM
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check output voltage. did you change any exciter wire to the alt? cause if you did it is resistance wire not normal wire

also there should be a fiber washer that prevents contact from the wire end to the alt. case. if that fiver washer is gone you will have a dead short <img src="graemlins/evil.gif" border="0" alt="[evil]" />

[ April 14, 2003: Message edited by: bullheimer ]</p>
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Old 04-14-2003, 06:17 PM
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The wiring is all original, and the alternator battery wire is a 10Red that runs to the fuse box...the fiber washer is there but keeps melting as the terminal heats up. I had shcuks <img src="graemlins/pain.gif" border="0" alt="[pain]" /> test the electrical system and it was only putting out a max of 12.8 volts when reved.
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Old 04-15-2003, 05:20 PM
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i'm having same type of problem. my + trem. on the alt is melting. constant attention to it is nessary , must keep term. tight or volts drop off to 9 volts & it runs on the battery only. this is my second alt. its only 3 months old & it's getting so i can't rely on it!the pos. post on the alt. gets loose after it melts a bit. is there a insulator made of bakalite so it won't melt? if you find am answer PLEASE let me know
p/s i have 1992 gmc pk/up 305 auto/air
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Old 04-15-2003, 09:17 PM
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sounds to me like your having the same problem I'm having. I would start by cleaning any corroded connections and checking for dead grounds. I found all the info I needed for my nova at <a href="http://www.madelectric.com" target="_blank">www.madelectric.com</a> I've also found that my most valuable electrical tool is the Volt, Ohm, Milliampmeter(sp?) I bought today. They're only like $16 for a good digital one and you can test continuity, voltage, and amperage through all your circuits with a little reading of the manual. Good Luck!
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Old 04-15-2003, 09:19 PM
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oops, that's <a href="http://www.madelectrical.com" target="_blank">www.madelectrical.com</a>
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