AGM Batteries

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Philyteach

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'Mornin Folks,
I just installed 2 DIEHARD Platinum PM-1 AGM batteries in my '05 Trophy. I've never used AGM's before so I don't know if this is something I need to check more into or a non-issue. The dash analog volt meter reads 16 volts (pegged) when running, but the smartcraft digital monitor reads 14.1 which is exactly what it always read with the lead/acid batteries.

What do you think? Is the AGM effecting the analog gauge somehow? Did the meter somehow take a dump over the winter? Does smartcraft measure from someplace other than the analog and there really is a problem?
 
My new solar controller shows a different voltage than my LinkPro monitor. I put a multi-meter on both as well as the batteries and have learned that the LinkPro is correct. AGM batteries have a higher float than flooded (14.3-14.4). I would trust your digital monitor but toss a multimeter into the mix to be sure.
 
If they aren’t connected to the same point there could be some resistance between the dash meter and the battery. Put the digital meter on the alternator connection point and se what’s up.
 
My resting and recommended float voltage from Lifeline on all my AGM banks is 14.3VDC. This is through any of the digital monitors I have on the various battery banks. 6 seasons and still showing no signs of degredation.
Bill
 
quote:
Originally posted by Philyteach

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What do I think? You finally bought the best bang for the buck marine batteries. Your analog meter has a problem. To be sure check with a digital volt meter at the alternator and at the batteries. I wouldn't be suprised if you don't creep up to 14.3 resting once they are fully charged.
Bill
 
Thanks folks. Boat goes back in the water on Sat morning. I'll check volts at alt. and bat terminals. Anyone think its worth pulling the gauge out of the dash and checking it there too?
 
Yes... check the voltage AT THE VOLTMETER with your digital meter.

It's really irritating to spend money to replace what turns out to be a perfectly good part.
 
Check the voltage at the battery. Seems the analog guage is not working correctly. The gauge does not care what type of battery you have; it only measures the voltage.
 
It needs to be checked at the battery, the alternator, the meter, and any place else you can think of. Only then are you going to get a clue as to what is going on.

Could be something as insidious as a loose or corroded connection, and you'll feel really stupid after you replace several expensive parts only to find out there's nothing wrong with them (been there, done that).
 
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