ALT gauge issues- clicks and pulses 69 DART. NEED HELP!!!

Threw a volt meter on battery and it jumped around quite a bit (13.75- 14.00) until she got warm- then sat at 12.85-12.90
and was 12.83-12.87 with a moderate idle. Did not see any big fluctuation (with alt gauge click/pulse) once it got warm.

Decided to pull the bulkhead apart and see what was going on there.
NOT GOOD... the bottom wire/second from left has the thick red 12v wire I was talking about.
Looks like there has been some previous issues and definitely going to have to tackle this. I would like to put a complete harness in it now but not in budget so I have a couple old wiring harnesses I may be able to salvage from. If anyone has any bulkhead connector plugs... I could use (3) of them. The ones on my car are cracked. I think the extra main bulkhead connector I have is in decent shape but need to check.

Anyway- I cleaned everything up the best I could using some sandpaper, electronic cleaner and dielectric grease and put back together. But plan on pulling everything apart hopefully in the next couple weeks and looking into the MAD bypass/volt gauge install.
Also picked up a new regulator and installed... still clicking. Starting to think its the ALT gauge itself.1 DART bulkhead.jpg