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RX-7 Alternator mod - negative spike diode needed?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed May 27, 2020 6:51 am    Post subject: RX-7 Alternator mod - negative spike diode needed? Reply with quote
Quote:

After my OV crowbar blew up, I took a closer look and am now wondering if I should add a diode from ground to the EM-36 field winding terminal to curb any negative spike.

Wouldn't hurt . . .

Quote:
Normally, without the mod, any negative spike resulting from powering the field winding would be absorbed by the three small diodes and rectifier diodes going to ground.

And perhaps I should also a diode in series with the wire from the breaker to the alternator field terminal so a positive spike from the field winding won't trigger the OV module?

No positive spikes . . . not necessary.

Quote:
BTW, the alternator does have a built-in capacitor over the output (B+) not shown on the schematic, but visible to the right in the photo and from the outside of the alternator, but doesn't affect the voltage regulator.

Nice work!


Bob . . .

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