1983 dodge ram 150 alternator problem

[icedogs66]

He guys I am new to the dodge world always had chevys until now I love this truck wish I would have bought one sooner. Any how alternator problem at the battery I have 12.9 volts after running truck for a few hours it drops to 11 then lower and lower until no start at the backof the alternator I only have the same voltage as the battery. the alternator is new and the regulator is new any ideas on this one. do the newer dodge alternators have abuilt in reg and are they compatible with the older trucks?

[turbomini]

the wire going to the alt that makes it charge is broke try jumping it with a nother wire..it should charge