I have purchased a Mars TRC-6800H coin acceptor and Coinco BA30B bill validator. I knew I needed a different harness so I bought a HJBA1 which adapts single price vending to a Coinco BA30B bill validator. But the plugs do not match up and I need to know the correct adapting harness.
The HJBA1 vending harness is a pass through plug the coin acceptor jones plug, plugs into. The other pulse plug joins to the bill validator, and the last plug goes to the harness out of the coin acceptor.
I usually go to my local vending machine dealers parts dept and tell the guy behind the counter exactly what I have and he gives me what I need. I can never remember the exact model numbers of all those different wiring harnesses, HOWEVER I think this might be what you need at this link:
http://coinvalparts.com/p-76-mei-low-harness-single-price-to-validator.aspx
BEFORE you buy it I would ASK the guys at that site to be sure it's the right one. If I am wrong they probably have the correct one. They are real nice and very helpful.
Hope this helps,
DARYL