Diodes in cooling fan feeds

larrywMember

Each of my radiator cooling fans has a pretty hefty looking stud mount style diode wired in series on the wires feeding my cooling fans.

They're mounted right at the fan connections using a big ring terminal on the diode base feeding down into the fan and the female spade terminal from the harness pushed onto the prong sticking out of the other end of the diode. Everything was neatly wrapped up in black tape.

What purpose would these serve? All I can imagine is that it would prevent the windmilling fan from backfeeding power into the wiring, but once the relay drops and quits sending power to the fan, how would any juice get back into the system?

Any ideas?

2/18/087:03 PM

Original Post

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