WHAT SIZE ALTERNATOR?

[shvrolay]

I have a close friend who is adding a pair of electric fans to his El Camino. He is running a FAST EFI unit (with it's electric pump+)
and a GV unit. What size alternator should he upgrade to?
He is now running a DELCO 12SI 94 amp. TIA

 

[Supe]

He's going to want good idle output. I'd recommend a 140 amp, with something that will put out over 100 at idle. It makes a big difference with EFI. There's a father/son on eBay who are building CS130's at 140 amps/110 amp idle for pretty cheap. I just went with one on my hill climb car.

 

[shvrolay]

https://rover.ebay.com/rover/1/711-...0001&campid=5338652022&icep_item=230968328045

Found it Supe............thank you.