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Old 03-06-2007, 10:23 AM
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Late model alternator

I am planning on installing a new alternator on my Chevelle. I want a high amp alt that doesn't have heavy rotating weight. I am installing an electric water pump so I will be making brackets anyway. I would prefer a late model GM one, that hopefully my pulley off my 70's style alternator will work. Does anyone know of something.

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Old 03-06-2007, 02:47 PM
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Doc here,

You might take a look at a GM , CS Series Alternator, High Current, 130 to 140 Amp output, about the size of an SI series, easy to wire (about like a 3 wire SI series) , and should do what you want.

These can be found on most late model GM cars..

Powermaster ALSO makes a line of different size , shape , weight Alternators for racing applications..

Be prepared for sticker shock..

Doc
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Old 03-06-2007, 04:35 PM
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One word of caution about the CS130 series. These are frequently found on FWD V6 applications. In many applications the alternator is mounted (and thus grounded) through the front frame only, but all the electronics are in the rear frame. The aluminum housing corrodes against the iron stator core, which breaks the ground path and causes the voltage regulator to die. I ended up replacing one annually for three years (fortunately the original replacement was a lifetime warranty) until I found the service bulletin that talked about this problem. The easy solution is to run a ground strap or wire from the rear frame to the block. Problem solved.
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Old 03-06-2007, 05:22 PM
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Doc here,

Good Point!

Always run a Ground wire from the Ground buss to the Alternator ground lug..(All alternators!)

Mounts being Chrome, or powder coated, or WELL painted just don't give as good a ground as needed sometimes..and that can change over time as well,

The solution : a 10 gauge ground wire to the ground CABLE At or near the starter..use STAR and Lock Washers, and BURNISH all paint and grease/Oil or dirt from the area, be sure the connection is tight.

Doc
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Old 03-06-2007, 05:25 PM
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alternator

I put an alternator from a 82 firbird rated at 100 amps on my 66 chevelle. check with Mad for their wiring kit. Cost of install was less than 150 bucks.
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Old 03-06-2007, 05:28 PM
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Quote:
Originally Posted by chevmal
I put an alternator from a 82 firbird rated at 100 amps on my 66 chevelle. check with Mad for their wiring kit. Cost of install was less than 150 bucks.
Doc here,

Curiosity..

What Alternator did you use..?

Doc
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Old 03-06-2007, 05:40 PM
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doc

sorry Doc, i do not know what type. It was a stock Delco off a 1982 Firebird that was rated at 100 amps. Oreillys had them because i had to replace it some years ago. Al
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Old 03-06-2007, 05:55 PM
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Doc here,

It was probably an SI series.. (two wire plug and one output lug (bolt) and ground lug..


If so, I didn't realize those harness's were THAT expensive!! I thought more like $15.00...

Assuming your stock system was a Generator/Regulator system ..or Alternator/regulator (external types)..

This won't make you feel any better, but you CAN build that harness for like less than $10 bucks if you have the plug..with some 14 gauge wire (brown and Red in color about 6 feet long.. ) and a solder Iron, and some shrink tubing..and about an hour of your time..

Here is how:





The CS Series differs from that a bit..but just as easy to make..If you have the plug..



Maybe tuck it away for next time...save some bucks..

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Old 03-06-2007, 06:03 PM
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alternator

Doc when i did this the kit was 25 bucks back then. Your info is great, ill put in my save pile. Al
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Old 03-06-2007, 06:09 PM
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Doc here,

Whew!

Glad to hear you didn't spend that much on it..

I'm thinking it's me for me to switch product lines..

Doc
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Old 03-08-2007, 05:54 PM
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On my '75 pickup I switched from a 63 amp 10si to a 94 amp 12si without any difficulty. Pulley size was the same and I used an OEM belt and mounting brackets. Just make sure the clocking is the same.

I also upgraded the charge wire to an 8 gauge wire, and ran it directly from the alternator to the battery, using a 12 gauge fusible link at the battery connection. I can turn on lights, heater and everything else in the truck and still show about 13.8-14 volts.

Bruc
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