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Alternator requirements w/ac |
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709karl
AMC Apprentice Joined: Nov/23/2011 Location: Sebastian, Fl Status: Offline Points: 190 |
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Posted: Mar/30/2023 at 5:03pm |
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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
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Life is too short to own a car that isn't green..BBG 69 AMX, Green 68 AMX
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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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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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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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3314 |
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The OEM upgrade for factory air was a 55 amp Motorola alternator, up from the 35 amp unit.
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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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. |
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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
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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RandyB
AMC Nut Joined: Aug/04/2020 Location: Florida Status: Offline Points: 462 |
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+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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Randy B
68 Javelin SST 343 73 Charger Rallye 340 triple Blk |
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RandyB
AMC Nut Joined: Aug/04/2020 Location: Florida Status: Offline Points: 462 |
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Randy B
68 Javelin SST 343 73 Charger Rallye 340 triple Blk |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3314 |
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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
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4826 |
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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.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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JD
AMC Addicted Joined: Mar/10/2009 Location: Missouri Status: Offline Points: 563 |
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"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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