hay guys could some one tell me if theres away to test the voltage reg. on my duster or what i should be looking for as to way my car want keep my batt. charged up...some time ago i put 1 of my truck batt. into my duster to go racing for the night it killed my batt. that night at the track so not thinking i went and got a 1000 cca batt. and it has been killing it the same way i charged the batt. last night drove the car down the road about 3 miles normal stuff on fuel pump, water pump motor, and cooling fan and back home went to start the car again no power...i put the batt. charger on it in the jump mode and started up did the old pull the wire off the batt. while its running to see if the alt. is chargeing and car still ran so i fig. the alt. is doing what it should...also could someone tell me which wore on the alt. goes to where so i can makesure thats right...the blue and green wire i have the square back alt. thanks im open to sugg. cause i know this will help to improve on the car....

lots of excellent tech on mopar charging systems and hardware ..here
search on this site...its excellent
look at the remote volt sensing amoung other topics

http://www.madelectrical.com/electrical-tech.shtml

cheapst

If you habe a decent volt ohm meter, LCD or LED read out so you can see tenths of a volt, read the voltage output going towards the battery on the output big lead. If it isn't putting out at least 13+ volts revved up right after starting the motor up take it to a decent parts store and have them check it out for you. I had a sqaure back go bad at the races earlier this month, I have a LED volt meter in the car now and the voltage dropped from 13.6+ to 14.2 down to 11.8 to 12.4 revved up Not enough to keep the battery up when running the electric fuel pump, MSD, wide ban and constantly starting the motor up during eliminations Luckily I run two big batterys and I was able to charge it enough between rounds that kept the batterys charged enough to get me to the end of the day before loosing in the 4th round

The alternator could be charging, but not charging enough. It could have a bad diode or the wire from the alt to the battery not big enough, bad connection (causing voltage drop) or belt slipping. Or the alt my not be big enough now. If you have a 37 amp alt and are drawing 40 amps, you will always be looseing ground. I agree with C A, take it to a parts store and let them check the output.
Brian

Here's a simple wiring diagram

http://www.harborfreight.com/7-function-digital-multimeter-92020.html

Set it at 20 ohms and check your voltage

thanks guys for the help im gonna get out and make a few checks today..i have a meter i can use to make the checks...mike