Reply to "Glowing radiator fan when at speed... cut off circuit suggestions ?"

rockyMember

Typical voltage drop across a diode is .7 V.

This will show up as a reduced voltage across the fan terminals.

Nevertheless if you have modern fans, new heavy gauge wire, good connections, and good relays, you should not have a problem.

i’m sure we will all be interested in your results.

Normally the diode solution was inserted because when the owner shut off the car with the fans running, but before the fans stopped spinning, they acted as generators. This kept the engine supplied with power, independent of ignition circuit. So the engine would run on, even after the key was turned off.

Keep us posted on your results, let us know if this fixes the situation. A temporary diode install would be very easy to do - you could do it with a couple of short wires and alligator clips.

Rocky

2/11/223:11 PM

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