I have installed an auxiliary electric fan at the radiator on our 1973 Mercury Capri and it’s controlled by an adjustable thermostatic switch. Wanting to know when the fan comes on, I wired an LED indicator light to fan side of the thermostatic switch and mounted it inside the car. Mission failure. The light comes on just from leakage through the thermostat. Ok, I figured maybe this is an LED issue. But no, a test with an incandescent bulb showed the same issue.
If the pilot light is going to glow all the time (dim at idle and brighter with revs, by the way), then it’s no good for the purpose intended. I wondered if anyone has a fix for this they can offer. A resistor, maybe? If so, what rating would be best? Appreciate any useful input.
Bowie Maryland USA
1973 Mercury Capri
1954 Citroen Traction Avant