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Olddodger 01-10-2010 10:30 PM

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

RamTech 01-10-2010 10:32 PM

What's the voltage at the battery terminals with the engine running?

Toms Blue Ram 1500 01-10-2010 10:37 PM

Have you had the alternator checked for amperage output ?

Olddodger 01-10-2010 10:41 PM

12.2 but it will decrease the more times I start it

Toms Blue Ram 1500 01-10-2010 10:50 PM

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 .

Quiet Lunatic 01-10-2010 10:57 PM

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.

Olddodger 01-10-2010 11:05 PM

The alt has been checked out at the autoparts store and it's "puttin out"

Olddodger 01-10-2010 11:11 PM

I have traced tested cussed replaced the fused links all my wires have been un wrapped so I could inspect all the wires

RamTech 01-10-2010 11:23 PM

Whats the voltage output on the back of the alternator?

Quiet Lunatic 01-10-2010 11:28 PM

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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