1967 Corvette Amp Gauge
To All.......What is the best way to test Amp Gauge. Mine has never moved at all either to the positive or negative side.
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Re: 1967 Corvette Amp Gauge
You probably have some corrosion in the plug at the firewall. I'd clean the plug and then a test could be as simple as turning on the lights with the engine off. Meter should deflect to negative.
Another test would be to connect a 1.5vdc (flashlight) battery to the appropriate contacts in the firewall plug that are connected to the ammeter for a short time. This should cause the meter to deflect...... -
Re: 1967 Corvette Amp Gauge
A very short time for the 1.5 volt battery...........like 2-3 seconds max. Gage should peg of one side or the other. Reverse the battery to check the other side of the gage.
Corrosion of the firewall terminals is the most common cause of problems with this gage.
FWIW.
LarryComment
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Re: 1967 Corvette Amp Gauge
This is what I do to test the Battery Gauge. 2 AA batteries, one is a brand new apx 1.5v, the other a old used battery at apx 1 volt. Connect the + of each to the 2 meter terminals, the - of each to meter ground(case).
With about a 0.5v delta between the 2 terminals, the needle should deflect slightly. To check opposite deflection, swap the batteries to the other terminals.
I usually pull the 2 terminal connector on the back of the gauge and use a voltmeter on each plug terminal. Engine off, key off, you should get 12.x volts on each one. If none on one or both, then a connector or wiring or fusible link fault. Turn a load on, like the headlamps or roll the buckets, and you should get at least 0.5v difference between the 2 terminals of the harness.
Be cautious using a battery directly across the 2 terminals as you may peg the meter and either knock the needle off or spin the shaft around if the needle gets raised above the stops. If it spins around 180*, your gauge will read backwards.Comment
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