A volt meter. An explanation why:
http://www.egauges.com/ATM_Tips.asp?TipPage=voltmeterammeter.htm
>From that: "All this [heavy wiring] might be worth the hassle if the ammeter
produced reliable information. But the ammeter can only measure the amount
of current output to the battery for recharging purposes: When the
alternator recharges a "low" battery, the ammeter indicates a high charge
rate; with a fully charged battery the voltage regulator reduces alternator
output, and the ammeter is supposed to indicate a very low charge rate. But
how can you really tell the regulator has reduced alternator output because
the battery is fully charged? Maybe a diode in the alternator rectifier
failed, or the alternator belt slipped after it warmed up, just as if the
battery were fully charged. Or maybe the meter indicates a medium charge
rate most of the time-does the battery want this much or could the voltage
regulator be overcharging the battery?"
His conclusion was that the volt meter was less trouble to install, had less
danger of short circuits; and produced more useful and reliable information.
James.
In reply to:
"OK-I am looking for a vote. If you could only mount one gauge, either a
voltmeter or an ammeter which one would you vote for?"
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