my 2005 hemi ram wont charge. i replaced alt and battery and still nothing

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bob1

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battery guage drops right to zero? even when i just turn the key forward to on, the battery gage sits at normal for 3 secs and then drops to zero without even starting it
 
I would do voltage drop testing on the wires. Connect the black lead of your multimeter to negative battery terminal. Then with red lead go along starting at the regulator output (approx 14V) checking connections until you get to battery positive. If you lose more than .1V over a wire, that is bad. It could always just be a faulty guage too. If you have 14V (cold engine) or 13.8V (hot engine). When checking battery voltage everything is fine. I'm only saying this because you never said it died.

I almost forgot. These checks should be done with the engine running.
 
There are 4 wires on the back of the alternator.

The Dark blue/red (large one) one should have 12v at all times. It has a fusible link which may be blown if no power there.

Red: This one should have power when the engine is running. Again, there is a fusible link on this wire.

Black should be grounded at all times.

LT Green Connects to the voltage regulator I believe is another ground.

Both fusible links are located on the Back side of the left wheel well. The first is black, Gauge unknown, The second is an orange 20 Gauge.
 
Check all you ground wires and fuses... may have a bad alternator.... if you can get it over to advance or autozone they will check the charging system for free... If you have a good batt but a bad alt the car will run until all the battery power is drained!
 
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