74 C20 Ammeter

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JP87

Junior Member
Joined
Sep 2, 2024
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Location
Buffalo
First Name
Joe
Truck Year
1974
Truck Model
C-20
Engine Size
350 SBC w/ QJet 4BBL
I inherited this C20. Runs & drives. Battery does charge while motor is running. However after looking around and peeking through the electrical and the cluster I’ve noticed the ammeter seems to be wired directly off its terminal posts instead of the printed circuit board connections. One side is ran directly to the battery and the other wired to the brown wire of the alternator. Based off research this seems like something they would do to add an ammeter on an old tractor. I’m curious if this is safe and a proper way to use the ammeter. Thanks
 

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ali_c20

Full Access Member
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Sep 20, 2016
Posts
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Location
Austria
First Name
Alexander
Truck Year
1974, 1979
Truck Model
C20, K5
Engine Size
350, 350
Welcome from Austria. Does the gauge work? If no you should think about a swap to a voltmeter.
This Thread has some info...

https://www.gmsquarebody.com/threads/ammeter-fuse-size.41156/page-2

Wiring diagram for the cluster and firewall junction.

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