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Old 10-31-2014, 11:26 PM   #1
Gmc-76
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5.3 alt on a 305?

Is it possible to put a alternator off of a 5.3ls on my 1985 305 motor? I already upgraded the stock to a "higher amp alt" from advance auto. I found one on eBay for a 5.3 that's 250 amp. All feedback is appreciated, thanks.
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Old 10-31-2014, 11:49 PM   #2
Just call me Sean
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Re: 5.3 alt on a 305?

I've got two 100 amp alternators on my '92.
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Old 10-31-2014, 11:53 PM   #3
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Re: 5.3 alt on a 305?

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Originally Posted by Just call me Sean View Post
I've got two 100 amp alternators on my '92.
Could you explain how to wire 2 alts? Thanks.
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Old 11-01-2014, 02:03 AM   #4
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Re: 5.3 alt on a 305?

I just got an identical alternator, ran the big red wire to the battery, and the pink/black wire I hooked to the pink/black wire from the other alternator. This is on my GMC conversion van. Two TVs, Nintendo, front and rear a/c fans, radiator fan, sound system. Lots of juice at idle now.
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