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post #1 of (permalink) Old 10-16-2000, 09:51 AM Thread Starter
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Another TR Upgrade ?-Alternator

I want to upgrade the alternator on my '77 CJ-7 AMC 304V8 (Prestolite, I believe) to a newer, internally regulated, Delco one. I happen to have one I believe is off an early 80's I-6 and am wondering if it will work/is compatable. Any ideas? I do have a wiring diagram from TeamRush and his description of this upgrade, I am just not sure if this alternator is the right one? Also, anyone know the amp rating for this alt? Thanks,

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post #2 of (permalink) Old 10-16-2000, 10:07 AM
 
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Re: Another TR Upgrade ?-Alternator

Can't help much with the id of the alternator but as to the amp rate, that should be stamped on the Delco alternator. Usually on the front half near the name stamp or on the earlier ones near the mounting ear. usually 65, 70, or 85 amp.
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post #3 of (permalink) Old 10-16-2000, 10:16 AM
FlMudCJ
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Re: Another TR Upgrade ?-Alternator

My '77 has a Ford Motorcraft alternator, and used to have the prestolite ignition. I believe the stock motorcraft is a 60amp unit, and has an external regulator on the backside of the fenderwell below the battery. The stock delco alternators used in jeeps are 63amp units, so I don't see an advantage to swapping. On your alternator there should be a raised cast 'motorcraft' on the backside. I'm un-familiiar with the prestolite alternators, but I'm pretty sure they wern't used on the '77 and up...

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post #4 of (permalink) Old 10-16-2000, 10:35 AM
 
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Re: Another TR Upgrade ?-Alternator

The advantages of swapping are...

1. Cost of replacement.
Delcos are everywhere, so they are cheap.
Usually under $35 at the local auto-jerks stores for the little ones.

2. Ease of service.
If you decide to fix your own, the repair kits and parts are available, and affordable.

3. Internal regulator.
Delco alternators have internal regulators, all others used on Jeep are externally regulated.
That means more wiring to get snagged on something, go bad, catch fire, ect.
Also, the regulator can be a problem in it's own right...

4. Interchangeability.
Most small delco alternators have a standardized, universal hook up, and the alternators will interchange.
If you want to upgrade to a higher output Ford alternator, you will have to change the wiring ends, regulator plug, and the regulator.
Prestolite has at lease 9 different regulator configurations.
Ford has 4.
Delco had just one type of hookup.

5. Delco only has two kinds of mounts on the lower feet, both are simple through bolts, Top mount is always the same. Wiring always the same.

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post #5 of (permalink) Old 10-16-2000, 10:51 AM
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Re: Another TR Upgrade ?-Alternator

but the Delco's have two different sized cases, correct...? Or am I mistaken? We were peaking in the computer at work the other day, and it looked to be 97amps was the highest amp alternator that is common that will bolt in to a jeep...

'77 CJ-5: 304/T-150/D-20 F-D44 R-9" Power 4 wheel disk, 36X12.5 swampers
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post #6 of (permalink) Old 10-16-2000, 11:56 AM
 
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Re: Another TR Upgrade ?-Alternator

Only about 1/2" in diameter, they will use the same brackets, depending on which foot you have, and I've not seen anywhere they wouldn't interchange.


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post #7 of (permalink) Old 10-16-2000, 12:05 PM
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Re: Another TR Upgrade ?-Alternator

This was posted a while back:

"1985 Corvette WITH A/C has a 120AMP alternator that is a DIRECT bolt and plug in and has a lifetime warranty at Auto Zone for $98"

post #8 of (permalink) Old 10-16-2000, 12:11 PM Thread Starter
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Re: Another TR Upgrade ?-Alternator

Hey all, thanks for the info and TR I got your e-mail, thanks I sent a reply. Anyway, I figured out, with a yall's help that I have the Prestolite ignition and Motorcraft alternator. I guess if the alt I have is good I will install it, if for no other reason that to get rid of the external volt reg. I believe it is a Delco but there are no markings on it whatsoever (maybe a reman'd unit) I also will do the TR basic upgrade for a '77 AMC V8. Thanks again for all the info and I will let you know how it all goes in a week or so.
77cj7304qtracTH400
79 frame, prepped and ready
83, parts jeep, just a frame, tub, axles (currently dismantling)

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