Like I said WM, put an OHM meter from case to field connection tab. If you get ZERO ohms then the connection tab is grounded to the case. If you actually get resistance then that tab is fine. I'm thinking you ordered a '69 and the second tab (that shouldn't be generally used on a '69) is grounded to case.
Ok, so here's what I'm getting..
What is typically (Was on old alt) Green wire's tab+case=000.0/000.1 ohm
Where Blue wire went on old setup?
I studied these at UTI somehow passed A6 A.S.E. lol
Been a few years, plus we focused on 99 & up vehicles..
Went got one from O'reilleys.
Got it bolted up, when I hooked NEG batt cable?
SPARK city! And nearly melted fusible link. Now, battery is Kaput. This is why I bought 3 harnesses from Year One..lol
THAT much experience I do have.. I'm taking Wuhan Reman Alt back, to buy new battery I guess.. ANY other tests or Diag. you can think of GREATLY appreciated!