altenator getting to hot - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 14th, 16, 08:38 PM Thread Starter
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Unhappy altenator getting to hot

I'm using a 80 amp SI alt. with the 2 wire plug and the red hot wire going to it. I used the american auto wire conversion where you use the block off plug on the end that used to go to the voltage regulater, and the little pigtail to change plug ends for the alt. I'll start by saying all electrical components in the car are working well. Battery is in the trunk, all grounds are good. None of the wiring is getting hot. Alt is putting out the right amount of volts to battery at 13.75 to 14. I have a test gauge close to alt. checking the amp draw. Turning everything on it's pulling around 30 amps give or take, that's electric fans, stereo, lights. Problem is altenater is getting so hot after about 10 minutes you could cook an egg. Even with electrical off and engine running it will throw a puff of white smoke. So hot you can't touch it. What's up with that? Never had that happen. You think maybe the alt is just screwed up inside? I'm thinking it might be the type of fan on it? Has the wierd "80's" (for lack of a better word) style fan. I can't see how it's pulling any air through it. Any thoughts?

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post #2 of 5 (permalink) Old Apr 14th, 16, 11:14 PM
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Re: altenator getting to hot

The fan on the SI alternators is supposed to cool better. I would pull the alternator and have it tested. It should be putting out about 14.7V when charging.

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post #3 of 5 (permalink) Old Apr 15th, 16, 03:40 AM
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Re: altenator getting to hot

Either high resistance or a bearing going are the first 2 thoughts for me.

Do as above, pull and get tested first.

Battery in trunk....I have a 8ga wire from alt to battery on my CS130.

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post #4 of 5 (permalink) Old Apr 15th, 16, 11:33 AM
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Re: altenator getting to hot

Belt too tight or too loose? I'd remove the belt and spin it by hand, you should be able to feel a tight, sloppy or rough bearing. Agree, should be slightly above 14v. If it's a parts store rebuilt it's a crapshoot as to what they actually might have replaced.


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post #5 of 5 (permalink) Old Apr 17th, 16, 08:18 AM Thread Starter
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Re: altenator getting to hot

Well, I changed the fan and that seemed to help alot. didn't get hot as fast but still to hot to touch after about 30 minutes now. It didn't blow out any puffs of white smoke running at 3500 rpm and voltage is still good.
Gonna keep an eye on it for now, got bigger fish to fry. After the shakedown run yesterday I had the right rear axle start walking in and out a 1/4" + on the 9". Felt the vibration. Yanked the axles. Can't see any visible signs of anything wrong. Acts like bearing thickness is wrong though driver side is the same and good. Seems like bearing retainer is not holding it and axle is sliding out towards it. But why now?
Gonna dive in it today and figure it out. If not, I'll stuff a peg leg 10 bolt in it for now just to run it. LOL
Big weekend here in redding, she's gotta run dammit! Thanks for the help.

67 RS 327, 4-speed, posi, done.
67 Modified, 454, TH-400, posi, under construction.
67 SS 396, 4-speed, basket case.
72 RS, sitting, partially done.
55 210 post, 2 door, 327 4-speed runs good.
55 2 door post, gasser project
69 Cadillac ElDorado
69 4x4 suburban
59 ElCamino

Some mornings, it's just not worth chewing thru the leather straps"
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