Charging System Resistor Diode?

Does anyone know the specs or part number of a Resistor Diode to use on the wire that comes out of the alternator and goes to the ignition system?

it is in this post picture.. coming off of the alternator plug #1...

 

OK, I've never heard of a "resistor diode". A diode is like a check valve, it only allows voltage to flow in one direction, install it bckwards and your circuit is dead. There is a component called a zener diode that has a "threshhold voltage", at which point it will allow "reverse biasing" or voltage to flow backwards through it. From the looks of the schematic, that tap feeds your ballast resistor and excitor voltage to the alternator.

 

go to radio shack,all you need is one that will handle 12volts d.c.,i got one there and it was real small,worked perfect,dont have the part# ,it was a while ago(without it the engine wont shut off,or is slow in shutting down,as it feeds voltage back to the ign. system)

 

You can also get them at the parts house if the parts guy knows how to look them up.

It is probably easier to go to Radio Shack like beernut said. get one that has a wire out each end that you can solder to.
You want to put it in so that electricity can go from the switch to the alternator but not back to the switch. Make sure you ask which way the flow goes before you leave The store.

 

If your looking to wire your ride, you might check out the tech link on the painless wiring website. It looks as though your schematic is real old. If you go with today's one wire alt, you wont have to deal with the old way wiring.

 

You can use a 12 Volt lamp in place of the resistor. This will act as a charging system test light and will light when the engine is off and the ignition is on. It will go out when the alternator starts to charge.