Reply to "Cooling Fan diagram, request."

George,

There are a number of drawings, articles and kits for the fan mod floating around. One published by Mike Drew, Terry, etc, some better than others. There are some variations on the wiring depending on the year and in fact on my 71 car the fan run current load did not go through the ignition switch. I did add relays near the fans because the 71 cars had the fan relay mounted on the relay panel under the dash.

From a safety standpoint and to prevent the possibility of my car burning to the ground, any of the relay mods I’ve done I’ve located the fuses on the power feed side of relays. This is especially important when a relay has ground potential on one of the terminals. In your drawing that potential is through the temp switches. I’ve had relays come apart internally and if there is a ground potential available you can have a direct short to ground resulting in maximum smoke and then fire. If nothing else the melted wire insulation causes a big mess makes and your car smell bad. Not a big deal unless the relay comes apart but I’ve had that happen a number of times with OEM relays on other cars and electronic equipment.

On the drawing posted by Larry you can see that the factory was mindful about the fuse location but not so smart about the ignition switch load.

Mike