Batteries

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Batteries

Home > Discussion Forum > Mechanic's Corner - Electrical

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All Messages in Thread	Author	Date
Batteries	Jerry	11-19-07
I can't figure it out. I charge both brand new batteries & they both read 12 volts with my volt meter. I put both of them back in the rig & it starts right up. I let it run for 10 minutes & while its running, my amp meter in the rig shows over 12. I shut it off & try to start it again & both batteries are so low, the starter won't turn over. Both batteries are reading less than 6 volts. I hook jumper cables to my truck & the rig starts right up. Let it run for a while & shut it off. Try to start it again, both batteries are down. Its like they are draining immediately. I spent an hour studying wiring diagrams & everything looks correct. What am I doing wrong?
Re: Batteries	rich	11-19-07
Check between ALT. & Bat. with meter set to AC & rig running. If you have a good AC reading your diodes are bad. They usually burn open, but they can let current go both ways and that will zap your Bat. very quick. Rich
Re: Batteries	sparky	11-19-07
You should have 14.2 running DC while running and meter is on DC check what is your alternator putting out- are you sure you have batteries hooked up correctly? is this a gas rig? normally one start 12 volt battery and 2 6 volts in series or 2 12 volt in parallel for the house circuits. richard in Va.
Re: Batteries	Jerry	11-20-07
Yes, my rig is gas. Dodge 440 motor. 2 12 volt batteries running through isolator & relay. When rig is running, my battery meter in the rig shows about 14 so it appears the alternator is charging. I used our companies load tester & when I hook it to 1 battery, it shows the battery is good but when I push the "load" switch, the meter shows the battery is bad.
Re: Batteries	Jerry	11-20-07
I was told that the deep cycle Marine/RV battery I got from Walmart will not hold up cranking my 440 motor on my rig even though it has 875 cranking amps. I was told to get a truck battery with 1000 cranking amps & that would solve my problem. I guess I can try that.
Re: Batteries	sparky	11-20-07
If they are dieing after running and the alternator is "charging" is it possible your isolator "diode's" are bad-? i rarely buy w/mt crap make them adjust battery-"if they will" sparky in Va.