65 voltage regulator ground issues

[John R.]

I bought a rebuilt correct voltage regulator for 65 327/365 no radio car. It does not function and I think the problem may be ground wires (I have a "new regulator" from NAPA that works Ok). The regulator has two ground wires, one to the alternator and one to horn relay. I tried to ground the regulator to the frame using another wire but that didn't help. Any ideas?

[Peter L.]

Re: 65 voltage regulator ground issues

John - If it was me, I'd contact the rebuilder and advise them of the situation and get their advice. If that doesn't solve the problem, then I'd return it and have them double check it. I trust they guarantee their work. Good luck, Pete

[John R.]

Re: 65 voltage regulator ground issues

Pete, thanks for reply, I've already talked to the vendor and he thinks there is a ground problem. Just trying to see if anyone else has experienced a similar problem. If anyone knows the correct wiring for to a 65 alternator ( especially the grounding) I would appreciate any advice. Thx

[Jim D.]

Re: 65 voltage regulator ground issues

The only separate ground wire in this circuit goes from the regulator to the horn relay. The alternator is grounded through the harness that branches off prior to the regulator. It also includes a large red wire and a two wire plug.

[John R.]

Re: 65 voltage regulator ground issues

Jim, Do I understand that the alternator ground through the harness attaches to the ground on the voltage regulator? I found the 65 assembly instruction manual and on page 214 it indicates that is how the ground is wired. But the separate ground wire from the regulator to the horn relay is not shown on the diagram. However, my car definitely has this separate wire. Using a new regulator from NAPA (I understand it has an internal ground), I can disconnect the wire from the regulator to the horn relay and the alternator still charges. I can't make the original regulator work with or without the ground wire between the regulator and the horn relay. So maybe the rebuilt original regulator is bad.

[Jim D.]

Re: 65 voltage regulator ground issues

Jim, Do I understand that the alternator ground through the harness attaches to the ground on the voltage regulator? I found the 65 assembly instruction manual and on page 214 it indicates that is how the ground is wired. But the separate ground wire from the regulator to the horn relay is not shown on the diagram. However, my car definitely has this separate wire. Using a new regulator from NAPA (I understand it has an internal ground), I can disconnect the wire from the regulator to the horn relay and the alternator still charges. I can't make the original regulator work with or without the ground wire between the regulator and the horn relay. So maybe the rebuilt original regulator is bad.

Sounds like you have a bad regulator. The separate ground wire , #2987004, is found on UPC 6, B4 in the AIM.

[John R.]

Re: 65 voltage regulator ground issues

Jim, thanks for the additional info about the separate ground wire. I am confident the wiring is correct.

[William C.]

Re: 65 voltage regulator ground issues

I think it is time to return it to the rebuilder for a checkup!

[John R.]

Re: 65 voltage regulator ground issues

That seems to be the best idea. Thanks