what meter do i need 4 power in batt?
tigra driver
11-11-2007, 06:43 PM
hi i have just got a dvd player in ma car and if i watch a dvd with the engine off obv its gunna run ma batt down so i need to no what meter i need in the car 2 show how much power i ave left in the batt so it dont die out on me!!!
curtis73
11-12-2007, 01:17 AM
Volt meter. You'll have to experiment with your car, but most batteries will show 14.4v while running and somewhere between 12.3-13v while off. If your volt meter drops to somewhere around 11.5v you might have trouble starting it, but that's where the experimentation comes in.
INF3RN0666
11-12-2007, 09:23 AM
From my experience, voltage isn't a good measurement of how much juice you have left. A battery with 12 volts is said to have only 25% charge, while 12.75 volts should have above 75% charge. Generally, people do a resistance voltage test. You hook up a high ohm resistor and test for voltage. That's called a load test. I dont really remember what resistance value it was.
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