Rad fan question

[Kinarfi]

The unit on the radiator is a switch for the indicator light on the dash, not a sensor, it is on when too hot, other wise, during normal temperatures, it is off. The one on the head, is for the ECM .

NOTE; If I remember correctly, the sensor has 2 temp sensors in it, each one referenced to ground, I could be wrong on this point, the schematic doesn't show a ground or a second output.

[Tinman]

Hmmm. I'll have to take a closer look. When I disconnected the rad switch, my faulty temp gauge that had the needle flopping all over the place stopped working completely. My idiot light never did light at all. So I figured that this switch was for the gauge. Either my machine is wired different (possible but not probable) or then the gauge just happened to quit when I disconnected the switch.

Thanks Kinarfi.

Either way, I'll be doing what Lenny suggested - tap another hole at the head.