Originally Posted by krazybob
I've read where some have used a Grand Cherokee 136 amp alternator on their 4.2 engines for help powering a winch. I'm looking for which year one of these will fit my '88 YJ without having to alter the mounts or wiring. Is there actually such an animal ?
For an ND? No. Your 88YJ uses a Delco alternator - 12SI, I believe.
The ND is externally-regulated by a circuit inside the PCM. To fit it would not only require making the mounting work, but you would have to fit a supplemental regulator as well.
The good news? The Delco SI and CS series alternators are probably THE most commonly-improved alternators out there, so it's easy enough to find the parts you need to crank it up. Any competent shop should also be able to rewind one for you without too much trouble.
You may also get a "one-wire" CS130 to get a good 140A out of it, still regulated, and should be able to make it fit without too much trouble (still internally-regulated, but the regulator picks up its sense signal inside the case as well. The only issue with "one-wire" units is that you have to keep half an eye on the voltmeter - if it drops, just blip the throttle to wake the alternator back up.)
Your YJ probably has a 61A alternator in it stock, which is midrange for an SI alternator. You can find SI units in GM vehicles of similar vintage - find one with as many electrical accessories as possible to get higher capacity. Also, you can go through the "Buyer's Guide" at a local staffed by competent
countermen to figure out an alternate application that will work for you, to give you higher capacity (the SI can be "reclocked" in about three minutes, and the pully may be swapped in about 30 seconds.)
But, if you're looking to "drop in" and ND into ANY Jeep made prior to 1991, it's not going to happen.