stephenscity

I have completed the rewiring of my super c and all is working great however I seem to be having a drain on the battery when it sets.The battery is old but still takes charge. If I disconnect it while setting it seems to hold O.K. The alternator is a delco single wire. Have checked everything and have no shorts and the starter was just rebuilt. I thought about a kill switch or diode but if I go diode am not sure what type or how it would work. There is nothing on the electical except ignition. nolights or accessories. Any Ideas?

cyrush

Silly Question??

If you disconnect the alternator, do y ou still have a drain ?? If so it could be a faulty rectifier diode in the alternator, Alternator generates A Cvoltage in a 3 phase configuration and the diode rectifier converts this to DC 12 -14 volts. whilst the diodes can be considered as a one way valve to electrical flow, they can occasionally fail open circuit which will drain a battery as you are experiencing.

Mickey

Slight disagreement. An open diode doesn't pass current in either direction. A diode that fails shorted can pass current in both directions. Being a little loose in saying shorted as it could be a med-low resistance but not totally shorted.

Can test as cyrush suggested but also put a multimeter across the output terminal to ground and check for resistance. Should be fairly low in one direction and high (multiple k ohms in the other direction.

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Miaugi

I had a similar problem with my IH 484 and decided the easiest way to solve it was to install a battery cut-off switch. This totally isolates the battery when not in use and serves (somewhat) as a theft deterrent as an added bonus. If you are interested I think I have another cut-off switch lying around that I could sell at a reasonable cost.