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alternator puzzle

N

notjustair

Well-known Member
Put a Hitachi alternator on my m following the drawing here. It charges great but is backfeeding the coil. The ignition switch won't shut it off. The coil and exciter wire join at the switch. My Hitachi did not have the "l and s" hookups labeled so I did what I thought was right. Could I have those flipped around? With the tractor off and ignition off there is still about half a volt at the coil. Could swapping those two wires around cure it? I thought about switching them but I wasn't sure if I would cook it.
 
The L terminal is the vertical part of the T shaped connector socket. The S terminal is the cross bar on the T. The lamp used as a "idiot" light in the L circuit. This lamp is connected with one lamp lead connected to the Alt L spade connector, the other lamp lead is connected to the coil (where the ignition power from the switch is connected. (if it has a ballast resistor, it is connected at the ignition switch side of that device.)
If the use of a diode is chosen the diode is placed in the same place as the lamp, with the band end of the diode toward the alternator.
If a resistor is used, (10 ohm) It is placed in the same way as the light.
Jim
 
You need a diode on the L terminal of the alternator so it does not backfeed.

I have that on my H.
 

The only thing I could add to what Jim and David have said, is I used a 1N914-1N4148 switching diode from Radio Shack soldered into the wiring with a generous length of shrink tube over it. Part # 276-1122 They are $1.69 for a ten pack, so you would have 9 spares.

-Horsepoor
 
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