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Old 03-03-2018, 09:57 AM
yossarian19 yossarian19 is offline
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Join Date: Nov 13, 2016
Location: Grass Valley, CA
Posts: 402
Upgrade from Motorola alt (searched already)

I know this must have been gone over a bunch but I've googled to the point of nausea and haven't found what I'm looking for.

I have a 1975 Wag w/ 401 and the Motorola alternator.
I put EFI & electric fans on it, so the Motorola probably isn't going to cut it.

I'm not attached to 12SI, CS130 or CS144. I can wire whatever I need to and have already bypassed the Ammeter.

Which alternators will physically fit, with 90+ amps output?
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Old 03-03-2018, 01:46 PM
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PlasticBoob PlasticBoob is offline
All Makes Combined
 
Join Date: Jun 30, 2003
Location: Long Beach, CA
Posts: 4,007
I'm not sure which, if any, alternators will physically fit in the stock location, but I went with the CS130 with the Bulltear mount. It mounts on the intake manifold, so the alternator sits higher.

The only issue I ran into was that I had to open up the bolt hole on the CS130.

Here's my notes:

CS-130 alternator pigtail: AC Delco part #: 8078, GM #: 12102921

CS-130 alternator from Autozone - Duralast Gold, #: 1352-5-11


Wiring: S-terminal - 12v switched wire from inside if possible. sense wire, senses voltage (red A)

L-terminal - 12v switched wire. (yellow B)

Belt: Napa XL 25 - 7435
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1974 Cherokee S, fuel injected 401, Trans-am Red, Aussie locker 'out back'
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Old 03-07-2018, 08:29 AM
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Woodchomper Woodchomper is offline
350 Buick
 
Join Date: Dec 17, 2002
Location: Saint Charles, Missouri
Posts: 923
The CS and SI alternators are a good choice for alternator conversions and the ones people use the most when upgrading. With that being said it would be cool if someone tried something different.

One of the members on this forum works for Denso. He told me about a guy in Cape Girardeau, MO that retrofits Denso alternators for hotrods. That got me thinking that anyone could probably do that if they had more info on Denso products such as given amp output by part number etc. Anyway, my buddy is getting me a catalog/parts list of Denso alternators. I'm curious if the Denso alternators have less of a HP load requirement than the Delco counterparts.

In the meantime check out this Powermaster modified Denso alternator:
https://www.summitracing.com/parts/pwm-8132/overview/
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