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I just recently put a custom dash with all autometer gauges in my chevelle. I re-did the whole wiring harness and hooked up all the gauges into the factory harness. My question is, I'm using a batter charger to power the circuits to make sure everything works. When I power the circuit for the voltmeter it only reads 10 volts. Now I have 3 settings on the charger, 2 amp, 10 amp, and 50 amp engine start. The 2 and 10 amp both read 10 volts, but when I switch it to 50 amp, it reads the 12.6 or what not, like its suppose to. Does this sound right?
 

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It's probably right. You can't use a battery charger for 12VDC power without a battery. It produces raw recified AC and the meter won't read it correctly, not to mention possible damage to other electronics.

The battery charger basically has a transformer and rectifier in it which is only 1/2 of a DC power supply. You need the filter caps to complete the power supply. Or, in this case, a battery.

Peter
 
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