[Sparky]

OK, here are the pictures I promised. The diodes I used are for a Delco 10DN alternator. They are rated for 25 amps. Just google "10DN diode" and you can find them from various sources. I got mine from eBay. The ones with the red leads are positive diodes, used for positive ground systems. The ones with the braided leads are for negative ground, which is what I have.

I took the cover off my cutout so you can see the internals. All the relay guts were removed. You can just make out where the relay contacts used to be attached to the upright metal bar. This bar is electrically connected to the generator output stud. Drill a hole in this bar the correct size for a press fit of the diode. A tight fit is important as the metal bar has to act as a heat sink.

The diode wire gets soldered to the metal part of the cutout that is connected to the output lug, where the battery wire gets attached.

I used this for a couple of years until I got a Fun Projects regulator, so now I keep it as a spare.