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Alternator requirements w/ac |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9081 |
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I thought so, even Billd mentioned it is better than SI series, but i never knew it fit Motorola brackets. I know later 80s with the SI the brackets changed to accommodate. |
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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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JD
AMC Addicted Joined: Mar/10/2009 Location: Missouri Status: Offline Points: 551 |
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Yea i had seen where people cut the aluminium shorter to get the GM alt. to fit the AMC bracket but if this one would fit without chopping on it that would be a big plus. Maybe Trader and Mopar_ guy will clarify.
Edited by JD - Mar/31/2023 at 6:30pm |
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6614 |
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If the alternator don't fit, you must acquit. Better to mod' the bracket than the alternator. If it goes dead, and you're a long way from home, a parts store alternator will get you home. Hogging out an alternator in a parking lot is no fun. |
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69 Javelin SST BBO 390 T10
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JD
AMC Addicted Joined: Mar/10/2009 Location: Missouri Status: Offline Points: 551 |
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Your right for sure BigBad69, modifying the bracket would be the way to go if you had to make it fit.Like you say do it once and you'll never get stranded hacking on an alternator and instantly voiding the warranty.
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Online Points: 5454 |
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Any time I read these posts I shudder at the thought of a stock wiring harness designed for ~60 amps maximum suddenly having about twice that much current impressed on it. If I ever upgraded an alternator to handle EFI or electric fans, I'd upgrade some of the harness also.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4805 |
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Yes, that's the common thing to do but not practical IMO. I would modify the brackets so it fits without modifying the alternator so it can be swapped out easily. I used a Motorcraft alternator before which worked nice that was easy to do. https://theamcforum.com/forum/motorcraft-alternator-upgrade_topic39960_post363799.html? If you do put a high amp alternator on, definitely hook it to the battery with a proper size fuse and wire. Do not run it thru a factory amp meter or you can burn it out and possibly cause a fire.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4805 |
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You don't really need to change the factory harness, just run the alternator output to the battery or the battery side of the solenoid with a fuse. Depending on how the car is wired, either dead end it or take the original wire and do the same with it. This way if the alternator is putting out it's max, it won't damage the wiring.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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The CS130 or SI will bolt into the same location as the Motorola. You may have to make some spacers and shorten the rear bracket, depending on the model/year of AMC/Jeep engine your bolting to.
As for adding circuits, yes they need separate wiring and fusing. The wire gauge for the alternator to the battery should be increased, only real change needed, #4 is fine for that short of run at 100 AMPs. The rest of the harness is fine as the factory circuits will only draw what they always have, nothing changes as long as you don't piggy back on factory circuits. IMO don't change the factory harness circuits, add new circuits separately with separate fuses. Small under hood fuse panel for your new circuits in this case would be perfect. The alternator will only produce what is required by the circuits connected. It's not pumping out 100 AMPs all the time and likely never would unless the battery is drained and then the battery is taking the load, which it is designed to do.
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Online Points: 5454 |
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I can't disagree with you. But if you added a big stereo, EFT, electric fans, etc. I could easily see an additional wiring harness to support and control the additional load. My whole point was simply to have people consider ALL the ramifications of a larger alternator in that it may not be plug and play.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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Mopar_guy
Supporter of TheAMCForum Joined: Jun/07/2009 Location: Ohio Status: Offline Points: 4805 |
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Oh I agree but I took it as just the alternator swap you were referring to.
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"Hemilina" My 1973, 5.7 Hemi swapped Javelin |
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