LS swap alternator issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

todd7498 · 04-12-2019, 09:28 PM

Hi, I did an LS swap in my 72 last year and have had alternator issues. Alternator charges fine until I turn on the A/C and it sucks the voltage down unless I rev it up, head lights or electric fans don't bother it but the A/C really seems to pull the voltage down. If I rev it up a bit and keep it around 900 plus rpm it seems to be fine. Any ideas? Thanks

Possibly I need a bigger alternator? I think mine may be the 105amp, I am running a stereo set up with a couple small amps, and dual electric fans.

04-12-2019, 09:28 PM	#1
todd7498 Registered User Join Date: Dec 2017 Location: Brandon Manitoba Posts: 10	LS swap alternator issues Hi, I did an LS swap in my 72 last year and have had alternator issues. Alternator charges fine until I turn on the A/C and it sucks the voltage down unless I rev it up, head lights or electric fans don't bother it but the A/C really seems to pull the voltage down. If I rev it up a bit and keep it around 900 plus rpm it seems to be fine. Any ideas? Thanks Possibly I need a bigger alternator? I think mine may be the 105amp, I am running a stereo set up with a couple small amps, and dual electric fans. Last edited by todd7498; 04-12-2019 at 09:51 PM.



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