12volt alternator conversion on a U

Alan K · Apr 24, 2013

Has anyone installed an alternator on their U? My cousins are intsalling one on theirs (I believe a delco) but he said the gauge shows discharge when running. Im wondering since they changed it from positive ground to negative ground if the gauge would be set up backwards now and that is why it is showing discharge? Does anyone have a wiring diagram for the change over?

Ill John · Apr 24, 2013

Alan, I think if you do a search on Tony Turners site it'll show a diagram.

Bob · Apr 24, 2013

Swap the wires between the two posts on the ammeter.

Alan K · Apr 24, 2013

Thanks John, will do.

Alan K · Apr 24, 2013

That is exactly what I was thinking. Thanks for your reply.

rvirgil_KS · Apr 24, 2013

Here's a diagram

On the generator/regulator setup you had a BAT charge wire from regulator to ammeter and a L wire from regulator to input of light/ignition switch.

With alternator you can tie L and Bat wires together, or use L wire for the Diode to #1 pin on alternator and power switch off of alternator side of ammeter.

Ammeter should read negative with lights/ignition on and engine not running.

Check coil wires. With negative ground for alternator the negative (-) post of coil goes to distributor

Alan K · Apr 24, 2013

Thank you for the diagram, I will pass it along to them.

Rich'sToys · Apr 24, 2013

The only thing I did different is I ran the wire with the diode directly to the Pos. terminal on the coil instead of all the way back to the switch. The result is the same, and you can get by with a shorter wire.

12volt alternator conversion on a U

Alan K

Well-known Member

Ill John

Member

Bob

Well-known Member

Alan K

Well-known Member

Alan K

Well-known Member

rvirgil_KS

Well-known Member

Alan K

Well-known Member

Rich'sToys

Well-known Member

Similar threads