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  #11  
Old 05-12-2014, 04:56 PM
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Quote:
Originally Posted by yellow98cobra View Post
I got 1 of these today I think the readings might be off, with key out 13.2 car started 14.1 ( It gives me the same range in the Mustang 13.4 - 14.6) driving @ 30 mph it read 17.9 then while idling at the light 13.4, then back in garage with key off 13.7 but bouncing up and down. Is it telling me anything?
If it reads 13.2 when it's not started either the gauge is off or it's not seating correctly. I guess you only get what you pay for. Sometimes less. Try hooking it directly to the battery with some alligator clips.

John
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  #12  
Old 05-12-2014, 07:39 PM
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Plug the meter in after the car was sitting over night. Don't start the engine until you see the numbers.

It takes time for a battery to settle down after being charged.
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  #13  
Old 05-12-2014, 10:01 PM
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You got me curious, so I just went out in the garage and checked battery voltage with ciggy voltmeter and a fluke digital VOM. I was getting 13.2v with the fluke and 13.0v with the ciggy voltmeter. Not to bad considering the cost. I keep a trickle charge on the battery so that is why it is a little high.
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  #14  
Old 05-13-2014, 05:21 PM
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Ok I plugged it in this morning and it read 11.8 after get her warmed up and just sitting there idleing it settled out at 14.5. It has now been plugged in for the last six hours and it now is reading 12.8
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  #15  
Old 05-13-2014, 05:43 PM
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I have one of the more expensive ones, but even it will freeze on a number after sitting for a while and pulling it out and re-inserting it gets things back on tract. Must be a pretty normal thing.
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