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Old 01-27-2003, 10:24 AM
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Post 12 Volt battery Amperage check?

How do you go about checking the Amperage of a battery without the engine running?


Todd <img src="confused.gif" border="0">

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Old 01-28-2003, 04:40 AM
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HEY TM: Battery current is a measurement of " FLOW" and it is measured IN LINE with an ammeter or with a clamp on meter. But the current must be moving or going somewhere. Why do you want to measure current flow?? AutoZone and some of the chain auto parts stores have instrumentation for measuring amps. DAVE
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Old 01-28-2003, 08:05 AM
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Dave: I think the battery is week. The Voltage is up, 12.87Volts but the car dosn't start right. I'm about to change the battery, don't want to be stranded. If it does the same thing with a fresh battery I'll change the starter. Just wanted to confirm that the battery was week.


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Old 01-28-2003, 08:42 AM
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12.87 volts (at rest) is not a weak battery. That's as good as it gets!

What's the voltage when cranking the engine, anything over 9V is also OK.

[ January 28, 2003: Message edited by: blockhead ]</p>
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Old 01-28-2003, 09:20 AM
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how many cold cranking amps does your battery have?
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Old 01-28-2003, 11:10 AM
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The battery begins to start the engine and dies righ off to nothing after 1 or 2 revolutions. I have to charge 6/8 amp then the car starts right up. I think the battery may have frozen and is shorted? When I put the charger on it goes right to between 6 and 8 amp every time. Charges for about 2hrs and car starts right up? Cold crank amp not marked on battery that I can see?


Todd
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Old 01-28-2003, 11:15 AM
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Personally, I would take it to a parts house and let them do a load test on it. It takes about 2 minutes, and will tell you if the battery has the guts to keep up.
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Old 01-28-2003, 12:06 PM
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HEY TM: Battery has to be tested under load. It can be at full rated voltage but not provide enough current output to turn over engine. I have a 1954 Chrysler that is 6 volt and a 1938 Lafayette street rod that is 12 volts. I had battery problems because of the down time so I went to the Optima Gel Cell batteries. They were about $ 130.00 but they do not self discharge, have a lot higher and longer craking power. It made a tremendous difference, espically in the 6 volt system. They cost more but will out last a lead acid by two or three times. The best thing to do is take battery into a store or shop that has a tester and it doesn't have to be in the car. This cold weather sure brings out the best in a old car!!! GOOD LUCK DAVE
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