Stock 37 Amp. Alternator won't do the job. - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 11th, 04, 10:53 AM Thread Starter
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I have been thinking about upgrading my 69 Z's alternator but don't want to put anything in that doesn't look stock. I have done some research but haven't come up with a satisfactory plan yet. My stock alternator only puts out 37 amps. Will just putting in a same style but higher output alt. do the job? I would like retain a pure stock look if possible. Could some of you that have done the upgrade please explain how and what you did and the results. I have all new wiring but I rebuilt my original alternator.
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post #2 of 8 (permalink) Old Apr 11th, 04, 11:23 AM
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Can you install the higher-output alternator used for A/C appliations? I think these are in the 62 amp range and still use the external regulator.


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post #3 of 8 (permalink) Old Apr 11th, 04, 12:03 PM
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carl is right on, the a/c cars had the 61 amp alt. same case and appearance. the cases show up on ebay alot. local shops can rebuild them for you. [img]graemlins/thumbsup.gif[/img]

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post #4 of 8 (permalink) Old Apr 11th, 04, 12:10 PM Thread Starter
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There is a local guy who says he can build me a 85 or 90 amp one with an original housing. I don't know if the wiring is up to the task. I've seen quite a few different mods to 1st. gen cars and I don't really like how it looks. I know looks are secondary, but like I said earlier, I would like it to look stock. The only thing I've added to the car is a 16" Spal cooling fan. I think it draws about 21 amps. The fan usually only runs when the engine is at an idle which makes the lights dim when I have my foot on the brake and the signal on. Thanks for the replies, I'll look into the higher amp A/C alt.
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post #5 of 8 (permalink) Old Apr 11th, 04, 01:14 PM
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Jim, I was in the same boat with my 67 Chevelle SS . I bought a 63 amp from Advance Auto and kept the 37 Amp ( paid the $8 core charge ). If you want originality for shows, you can always swap ...
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post #6 of 8 (permalink) Old Apr 11th, 04, 03:23 PM
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The trick is that some of those high output alternators don't put out very well at idle. But I can't speak to one or the other. I put in the CS130 style but it definately isn't stock.

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post #7 of 8 (permalink) Old Apr 12th, 04, 01:23 AM
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I would probably go with an alternator upgrade to 12SI or as dnult suggested, a CS130.

If you're not showing the car in concours, I don't think others are going to remove points for orig alt being exchanged.

I would suggest if this route is taken, you would have to rewire the supply line, the present red #10 AWG, with #8 AWG from the firewall to the horn relay, to the alternator, and to the battery. Don't forget to upgrade the ground pigtail.

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post #8 of 8 (permalink) Old Apr 19th, 04, 07:42 AM Thread Starter
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Sorry for the late reply.
Thanks everyone for the suggestions. I'm gonna try the locally built 90 amp one first. The guy at the shop says that it will charge at idle and doesn't recommend going to a larger output without making the wiring larger to acommodate the extra amperage. I agree. My car has the repop spring ring battery cables with a barely 12 ga. supply wire from the battery. I run my cooling fan directly off the starter to avoid burning up the small supply line but the alternator doesn't like all this stuff running at an idle.
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