Posted by Bob M on March 18, 2009 at 04:37:06 from (151.190.254.108):
In Reply to: voltmeter setup posted by JeremyG on March 17, 2009 at 20:31:28:
A better quality voltmeter draws so little current it can safely be wired permanently "on". Simply wire the voltmeter + to the battery + (or the hot side of the starter switch), and the voltmeter - to a good ground.
To determine resistance take a VOM or DVM and measure the resistance between the voltmeter's + and - terminals. If it's more than about 400 ohms there's no need to switch the voltmeter off with the ignition.
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The red and white wires are most likely for an internal illumination bulb as Charles suggests. If it is and you want the gage to light up, connect the red to the headlight switch and the white to ground.
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