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voltmeter connection preference
If you want the most accurate readings, the voltmeter leads should connect directly to the battery. If you connect anywhere else in you 12v system, corrosion, loose connections, etc. may affect the accuracy of your readings. In other words the voltmeter reading may not be the actual battery voltage--and that's what you need, right? The leads for the voltmeter do not have to be heavy gage, there is practically no current (microamps) flowing thru the meter.