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Ammeter wiring for 1952 3100 #1310102 Thu May 09 2019 01:56 AM
Joined: Feb 2019
Posts: 141
Phak1 Offline OP
Shop Shark
While chasing electrical demons on my 52 1/2 ton with a 12v conversion, I hooked up the ammeter according to the diagram in Chevrolet Truck Shop Manual and the gauge worked backwards. Meaning without running, pulling on the headlight switch showed positive (charge) and after starting, the gauge would go negative (discharge). The diagram shows the battery positive is connected to the positive side of the ammeter and the alternator is connected to the negative side. I checked voltage at the alternator and it was 14.1 volts.

I looked for a generic diagram on the internet for hooking up a ammeter and it shows the opposite. The battery positive goes the the negative terminal of the ammeter and the alternator goes the positive side of the ammeter.

I swapped the wires and it seems to function correctly. Has anybody else noticed this or am I totally wrong?

Last edited by Phak1; Fri May 10 2019 01:05 AM. Reason: Grammar

1952 Chevrolet 3100 w/59’ 235 & hydraulic lifters
Original “Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Ammeter wiring for 1952 3100 [Re: Phak1] #1310111 Thu May 09 2019 05:02 AM
Joined: Feb 2013
Posts: 198
Eureka Jim Offline
Shop Shark
You've got it right now. I just did the same job and wired the battery to the starter and the starter to the discharge side of the gauge, while the alternator went to the charge side of the gauge. Works fine for me.

Moderated by  Rusty Rod 

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