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 Post subject: Re: New best 1/4 mile
PostPosted: Thu Jul 19, 2018 11:31 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 947
Location: Texas
Falcon67

Chris, what vehicle did you get that alternator from?

Also, the last time I checked with the fuel pump on, fan and parking lights it would read between 12.4 to 12.6 volts. With only the fuel pump on it will stay around 13.5 or so. Its that damn stock regulator- i just know it. Im surprised no aftermarket companies have made an aftermarket external voltage regulator. Summit rates their 14 inch fan thats on my car at 7.5 amps draw. I tested it with a clamp meeter and it was actually dead on 7.9 amp draw. Tested my Holley Black pump. It was a dead on 4 amp draw.

this is the combo I have
https://www.summitracing.com/tx/parts/s ... ocation=tx


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 Post subject: Re: New best 1/4 mile
PostPosted: Thu Jul 19, 2018 4:42 pm 
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Joined: Tue Nov 06, 2012 12:02 pm
Posts: 283
You need an amp clamp and a volt meter to test it.

I doubt it's your regulator. The regulator has no idea on the amperage that the alternator is putting out. As long as the regulator is full fielding the alternator when full load is applied, there isn't much more that it can do.

I'm still on the alternator band wagon. I've seen time and again when old alternators are upgraded to provide more amps, they lose their ability to charge at idle.

A quick test for you would be to install an amp clamp around your alternator wire and put your volt meter on the battery terminals. Start the engine, put on all the loads you want to run, and see what the voltage and amperage readings are. Rev the engine up to 3-4k rpm and see if the readings change.


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