Well I have the key switch power coming from the fuse block then teeing off and one going to the vr and one going to the alternator and the green field wire going from alternator to the vr.Is that right?

 

Do you have a manual for your truck? I had the same problem with my 85 d350 dually and i replaced the alternator, voltage reg, still no charge, had alt tested ok, so I went thru the complete test procedure in the factory manual, found the new vr was bad. When it was replaced it was charging. I can e mail you the test pages from my book it you need them

 

Yes I do have a actuall 84 shop manual! I was thinking about adding more grounds.what's a good spots to add grounds to? ? Right now I have one from the starter to the frame" braided " one from negative sided of battery to radiator support, and of course the negative battery cable to the block. Thanks guys for all your help

 

I have always tried to ground as much to the frame as I could. makes it easy to reach in case I have an issue.

 

So you have voltage running to the alt in more than one place? If so that may be your problem. The voltage to the alt should only be at the large bolt on the back of the alt. The 2 field current wires go to the reg with an ignition pos to the top pole of the reg.

 

Well I finally got the old truck charging . I guess through all the testing and retesting some how the two vr wires got crossed and kept blowen the vr's so I fixed that and with a new vr I am getting 13.6 at idle! !! Finally I can drive the ole truck! ! Thanks guys for all your help and patience.

 

Glad to hear it man! Congrats and glad we could be of help.