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  #1  
Old 01-10-2010, 10:30 PM
Olddodger Olddodger is offline
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Default Battery not charging

I'm going to as brief as possible but will cover everything I have tried. I've replaced "new" bat,volt reg and alt. I've did a field test on the alt and it's charging. The system is grounded well. I've made a continuity check on everything. There are no shorts that I have found. The dash has been removed and all the wires have been checked. Folks what am I missing?The battery starts out 12.2 and decreases everytime I start. The amp output on the alt is above the normal 13.5 when I did a field test on the alt

Last edited by Olddodger; 01-10-2010 at 11:00 PM. Reason: Missing tech info
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Old 01-10-2010, 10:32 PM
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What's the voltage at the battery terminals with the engine running?
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Old 01-10-2010, 10:37 PM
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Have you had the alternator checked for amperage output ?
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Old 01-10-2010, 10:41 PM
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12.2 but it will decrease the more times I start it
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Old 01-10-2010, 10:50 PM
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Voltage wise your alternator should be putting out 13.5 - 14.5 volts .
There is a test known as a Amperage test that verifys the alternator is capable of producing the amount of amperage it's rated for .
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Old 01-10-2010, 10:57 PM
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If you only have 12v at the batt with the engine running, and you know that the alternator is in fact putting out, it appears as if there's an open wire between the alternator and the battery. You'll have to physically trace it out, look for any melted fusible links or other burned spots.
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Old 01-10-2010, 11:05 PM
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The alt has been checked out at the autoparts store and it's "puttin out"
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Old 01-10-2010, 11:11 PM
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I have traced tested cussed replaced the fused links all my wires have been un wrapped so I could inspect all the wires
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Old 01-10-2010, 11:23 PM
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Whats the voltage output on the back of the alternator?
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Old 01-10-2010, 11:28 PM
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Sounds like you've done all the obvious stuff. Maybe you got a bad new regulator (I'm assuming it's an external unit)? I've bought bad parts before...sometimes it happens. You got a junkyard handy to get a used one for cheap for troubleshooting? Or would the autoparts store have one they'll stick in for a minute in order to check voltage?
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