lights oscillate bright and dim whats going on

I would make the same checks as posted in this thread, especially harness drop and regulator ground

http://www.forabodiesonly.com/mopar/showthread.php?t=235311

A temporary test for feedback loop problems might be to

1--add a no12 or larger ground between engine and regulator. I actually like to use a no4 starter cable. Buy one a foot or so, and look at your passenger side front of the head. Those bolt holes for the alternator are UNUSED on the REAR of the driver side. Bolt the starter cable to the rear of the head, and either a substantial bolt through the firewall or to something like the master cylinder studs. Clean and remount the regulator, using star washers, and or add a jumper ground wire to one of the regulator bolts

2--As a purely temporary test, get yourself a male and female push on spade connector like on your alternator field. "TEE" a long about no14 or larger wire into the male and female spade. Hook this up to your alternator field which the blue is hooked to, and hook the blue back up, so you have the (( alternator field---blue field wire -- the test wire )) all wired together.

Devise a way to solidly hook this to the battery---vise grip, battery clip, etc, or to the big starter relay stud, and BE CAREFUL with the bare end. Start the car, and with the headlights on and "cycling" hook/ unhook this test wire to a battery source, and notice whether or not this stops the problem. Again, be CAREFUL with this lashup, because that wire is hot anytime the key is in "run."

If this DOES stop the problem, you have a voltage supply problem from the battery, through the harness, the key, etc, and to the regulator IGN terminal.