generator-alternator

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Feb 24, 2026 | 12:16 PM

Pop's 56 F100

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Pop's 56

Joined: Aug 2023

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From: North Hills California

generator-alternator

I'm installing a Generator-alternator, ( an alternator that looks like an original generator), in my 56 f100 because I have a HEI ignition and I'm hopping to improve the performance. I've read that a volt gauge is recommended over an amp gauge due to the high output of the alternator heating up the wiring. Shall I disconnect the amp gauge and install the volt gauge or run both. Is there a risk of fire with the amp gauge connected? Thanks in advance for any input.
Rick

Feb 24, 2026 | 12:46 PM

bmoran4

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From: Western NY

Well, lets look at the specifications for some answers:

What is the rating of your generator?

What is the rating of your new alternator?

What is the range of your amp gauge?

Feb 24, 2026 | 04:23 PM

Pop's 56 F100

Thread Starter

Pop's 56

Joined: Aug 2023

Posts: 102

Likes: 74

From: North Hills California

Not sure if this is the rating. The amp gauge goes to 60 amps

This came with the alternator.

Feb 24, 2026 | 04:25 PM

Pop's 56 F100

Thread Starter

Pop's 56

Joined: Aug 2023

Posts: 102

Likes: 74

From: North Hills California

Not sure what the generator rating is

Feb 24, 2026 | 04:50 PM

bmoran4

Parts Nerd Extraordinaire

Joined: Sep 2010

Posts: 4,381

Likes: 1,790

From: Western NY

Just giving a quick look over things here, the largest generator in the Ford book was 60 amps, and that seems to match your amp meter range. The 82101-2 alternator you show is rated for 90 amps. As such, the gauge cannot reflect the full range of the alternator. This may or may not have longer term consequences for the amp gauge if consistently pegged out of range.