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Alternator requirements w/ac
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709karl View Drop Down
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    Posted: Mar/30/2023 at 5:03pm
Hello, I'm preparing to put Vintage ac in a 68 AMX.  They say a min. 70 amps alternator is required with an electric fan. Has anyone got advice of the best direction to take from the original 35 amp Motorola unit.  Thanks in advance
Life is too short to own a car that isn't green..BBG 69 AMX, Green 68 AMX
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304-dude View Drop Down
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Most just grab a late 80s Jeep Sanden bracket and leave the alternator brackets. They fit GM Si10 and other Si cases. Put a want ad.
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sweatlock View Drop Down
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Points: 2964 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sweatlock Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2023 at 6:33pm
The OEM upgrade for factory air was a 55 amp Motorola alternator, up from the 35 amp unit. 
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304-dude View Drop Down
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Originally posted by sweatlock sweatlock wrote:

The OEM upgrade for factory air was a 55 amp Motorola alternator, up from the 35 amp unit. 


Not good enough for electric fans and ac... that was his question on upgrading. BiLld also stated there is a police motorola with 65A rating. Probably good enough, if you ask him.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Trader View Drop Down
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  • Delco CS130 Series (100-105 Amp /Single V groove pully) Delco 1101229, 1101275, 1101292 / Lester 7808, 7888 used on 88-90 5.0L Buick Estate Wagon, Cadillac Fleetwood Brougham (RWD), Chevrolet Caprice, Oldsmobile Custom Cruiser and Pontiac Safari.
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RandyB View Drop Down
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Points: 442 		Post Options Post Options   Thanks (0) Thanks(0)   Quote RandyB Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2023 at 7:22pm
+1 what Trader posted.

I am doing FI and electric fans and by the calculator I used it is 110 amps, so I upgraded to a 150 from Powermaster.
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RandyB View Drop Down
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Points: 442 		Post Options Post Options   Thanks (0) Thanks(0)   Quote RandyB Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2023 at 7:24pm
Originally posted by RandyB RandyB wrote:

+1 what Trader posted.

I am doing FI and electric fans and by the calculator I used it is 110 amps, so I upgraded to a 150 from Powermaster.

I am adding a dual fans, they are rated at 25 amps with 50 amps at start up.
Randy B
68 Javelin SST 343
73 Charger Rallye 340 triple Blk
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sweatlock View Drop Down
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Points: 2964 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sweatlock Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2023 at 7:29pm
Originally posted by 304-dude 304-dude wrote:

Originally posted by sweatlock sweatlock wrote:

The OEM upgrade for factory air was a 55 amp Motorola alternator, up from the 35 amp unit. 


Not good enough for electric fans and ac... that was his question on upgrading. BiLld also stated there is a police motorola with 65A rating. Probably good enough, if you ask him.

OP said electric fan (singular), not plural. Not clear whether blower fan was being referred to or engine cooling fan(s). Not sure why Vintage Air aftermarket AC would reference alternator amperage requirements for engine cooling fan(s)? 

What I stated was accurate with regards to the OEM upgrade when equipped with factory air conditioning. 


Edited by sweatlock - Mar/30/2023 at 7:34pm
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Mopar_guy View Drop Down
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Points: 4390 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mopar_guy Quote  Post ReplyReply Direct Link To This Post Posted: Mar/30/2023 at 7:33pm
A 70 amp will handle twin fans with no problem. If you use a variable speed controller, the system won't see the big draw when the fans kick on or use as much amps running since they're not running full speed. DMack is running a Motorola 55 amp, with the Contour fans and A/C using the Northern Radiator fan controller with no problems. The alternator Trader lists does fit and work well.

"Hemilina" My 1973, 5.7 Hemi swapped Javelin
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JD View Drop Down
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Points: 534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JD Quote  Post ReplyReply Direct Link To This Post Posted: Mar/31/2023 at 6:02pm
"The alternator Trader lists does fit and work well."

This alternator that Trader listed will fit the AMC brackets without any cutting or modifications?
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