Charging problem
OK, the first thing to do is isolate the problem to engine side/ or interior side of the firewall
Second thing to do is check the regulator if necessary by doing some simple (temporary) rewiring
PRELUDE: You could have a component problem, IE alternator, regulator, ammeter, or a wiring/ connections problem
SO
First, go over your grounds, make sure the battery is solidly grounded to the block (front mount/ trunk mount?) and make sure you have a good jumper from the block to the body/ frame.
Next, make up a big at least no 10 wire and ADD it to the alternator stud, run it right over to either the starter relay stud or the battery itself.
See if this "cures" the problem. You'll have to check with a voltmeter to see if it's regulating. Check FIRST with a voltmeter before you install the bypass, then after to see the difference.
If this doesn't "do" much, leave the bypass in place, and unhook the regulator "ign" terminal. Now wire a temporary wire from the regulator to the battery in such a way that you can (and will) disconnect it as if it were the IGN switch, IE do not let it sit there not running for more than a minute.
If either of these tests show an improvement, you have a problem with the bulkhead connector, the wiring, or the ammeter or it's connections.
ALSO IN the main under dash harness is a great big multi-wire splice. I've seen at least 3 of these fail over the years, it's a little work, but you might consider tearing into the dash, untaping the harness until you find the splice.
Here's a shot of what all comes together from the 72 manual. If you don't have one you can download one free, here
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download
wire R6A-12BK goes up to the ammeter
wire R6-12BK goes out through the bulkhead, I think to the ammeter
OK, the first thing to do is isolate the problem to engine side/ or interior side of the firewall
Second thing to do is check the regulator if necessary by doing some simple (temporary) rewiring
PRELUDE: You could have a component problem, IE alternator, regulator, ammeter, or a wiring/ connections problem
SO
First, go over your grounds, make sure the battery is solidly grounded to the block (front mount/ trunk mount?) and make sure you have a good jumper from the block to the body/ frame.
Next, make up a big at least no 10 wire and ADD it to the alternator stud, run it right over to either the starter relay stud or the battery itself.
See if this "cures" the problem. You'll have to check with a voltmeter to see if it's regulating. Check FIRST with a voltmeter before you install the bypass, then after to see the difference.
If this doesn't "do" much, leave the bypass in place, and unhook the regulator "ign" terminal. Now wire a temporary wire from the regulator to the battery in such a way that you can (and will) disconnect it as if it were the IGN switch, IE do not let it sit there not running for more than a minute.
If either of these tests show an improvement, you have a problem with the bulkhead connector, the wiring, or the ammeter or it's connections.
ALSO IN the main under dash harness is a great big multi-wire splice. I've seen at least 3 of these fail over the years, it's a little work, but you might consider tearing into the dash, untaping the harness until you find the splice.
Here's a shot of what all comes together from the 72 manual. If you don't have one you can download one free, here
http://www.forabodiesonly.com/mopar/showthread.php?t=132309&highlight=manual,+download
wire R6A-12BK goes up to the ammeter
wire R6-12BK goes out through the bulkhead, I think to the ammeter
