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Some of the pre 94 trucks had 100 amp alternators on them. They use a different bracket than the stock alt, so you need to snag that too. I know my 79 came factory with about a 68 amp or so, so the 100 is a big upgrade if you have the small one.
 

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Trailduster79 said:
Some of the pre 94 trucks had 100 amp alternators on them. They use a different bracket than the stock alt, so you need to snag that too. I know my 79 came factory with about a 68 amp or so, so the 100 is a big upgrade if you have the small one.

this is what i plan to use is the big 100 amp alt, but i would recommend a heavier jumper wire from the alt to the pos of the battery so all the amperage isnt going through the bulkhead connector. could be a smoke show in no time. ;)
 

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I highly recommend the 100/114 amp alternator for the older trucks. I hooked mine up with 4 gauge right to the battery and the head lights have never been so bright. They don't even dim the slightest when the engine is just idling. Be sure to add a voltmeter so that you can still monitor the charging system.
 

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PJTPW said:
Are the cases the same physical size on the higher output alts?

Ryan
On the older trucks, the 100/114 amp alternator is MUCH larger than the standard ~65 amp alternator. It requires a completely different set of brackets. They are common on high optioned '70s-'80s cars, trucks, and police cars up to about '86 or '87 I believe.
 

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rockmup is right, you should be able to swap pulleys on the newer alternators. There was an article a couple of years ago in Mopar Action about running the newer nippondenso alternators on old muscle cars and stuff. From what I remember of the article, it sounded like it was basically a bolt in but a few minor mods were needed.
 
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