Re: Diode in alternator system

Posted by john in la on March 05, 2005 at 17:24:11 from (68.222.28.138):

In Reply to: Diode in alternator system posted by Bret4207 on March 05, 2005 at 06:57:38:

Bret;
If you needed a diode you would know it long before the battery went dead from a discharge problem. You would not be able to shut off your tractor if you needed a diode.

The #1 or F plug on the alternator gets hooked to the terminal block key on side. It only gets power when the key is on. The problem is on a gas engine the coil also gets hooked to this same spot. When you turn off the key to cut power to the coil and kill the motor you get a back feed from the spinning alternator which keeps the coil firing so the engine will not kill.

GM used a idiot light in this wire to break the backflow. Since some tractors do not have a place for this dash idiot light another way of doing it is ti install a one way diode in this wire. This allows you to supply power to the alternator to energize the field but stop the backflow to the coil.

I think your problem is you have something wired wrong. I may be out on a limb here but since all your conversions do the same thing I suspect that you have the #1 wire hooked to power all the time and not hooked through the key. This will drain the battery for sure.

While This wiring diagram is for a Ford it should get you on the right page to see if you have it wired correctly.

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