Alternator size and electric cooling fan - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 6th, 06, 05:06 AM Thread Starter
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Alternator size and electric cooling fan

Okay guys, I'm thinking of running an electric cooling fan. I've read all the posts here and at PT (much like JimM has be poring over the disc brake info). Wiring is not an issue; my American Autowire Classic Update harness has a dedicated fused circuit for an electric cooling fan. My question is more on the current required.

My electrical engineering course was a long time ago, so I am just struggling with some of the basics.

I have a Dave Ray HEI (12 volt, don't know the amp draw off the top of my head), normal stereo (25W x 4 RMS, I think), and factory lighting. I'm going to add Billy Morris' driving lights, but they shouldn't add too much.

Right now I have an OE replacement 10SI, 63A alternator. The Spal fan I'm looking at (30102049, 16" single puller) draws a max of 19A. I don't have the ratings for my wiring harness here, but I think the fan circuit is 25 or 30A fused.

Lots of info (sorry) to get to one simple question: how do I know if the alternator I have will be enough? Seems to me I can just add up all the loads, but I guess I'm not sure how to do that.

It's real simple, but electricity is not my strong suit.

Eric
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post #2 of 7 (permalink) Old Mar 6th, 06, 01:14 PM
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Re: Alternator size and electric cooling fan

I would take a voltage reading at the battery with all the accessories on at idle that you think you would use all at once, headlights, radio, heater blower, etc. If you're already below 12 volts at idle I would upgrade the alternator. If not wait until you put the electric fan on, then check it again with the fan running.

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post #3 of 7 (permalink) Old Mar 6th, 06, 02:17 PM
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Re: Alternator size and electric cooling fan

Chances are that you will need the 100 amp alternator with all the accessories plus the electric fan. I'm basing this on my IROC, which has the 94 amp and is fully loaded with A/C and with an electric fan.

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post #4 of 7 (permalink) Old Mar 6th, 06, 02:31 PM
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Re: Alternator size and electric cooling fan

The 10si is not going to give you current to drive that fan at idle. At 1500 rpm, it would, but not at idle. I have same alternator, and even headlights are marginal at idle. Not a huge problem for you until the day you spend 45 minutes or more idling in traffic at night.

A 100 amp 12si (internal reg) alternator would be better.





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post #5 of 7 (permalink) Old Mar 6th, 06, 06:29 PM Thread Starter
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Re: Alternator size and electric cooling fan

Okay, that was my gut feel too. Great, now all I have to do is figure out an application with a 94 A (I see replacements at 78 and 94 A ratings) to feed the highly qualified individual behind the Autozone counter....

Found it already. Looks like every big block and small block V8 GM product got the same 94A alternator.

Eric
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post #6 of 7 (permalink) Old Mar 7th, 06, 07:27 AM
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Re: Alternator size and electric cooling fan

I have a similar issue with my 69z28. I find it runs a little low sometimes at idle. What application did you fine to have the correct clocking?
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post #7 of 7 (permalink) Old Mar 7th, 06, 03:17 PM
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Re: Alternator size and electric cooling fan

NAPA sells one, Part # 213-4356. Also need plug # VRC148. Good luck Pete

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