Discussion
A fan will take maybe 15-20 amps in continuous running and >30 starting.
Above about 70mph the fan windmills enough to generate sufficient juice to light the lamp. I have a Vonhosen light
Steve_D said:
The fan switch will have to power the relay as the currents are way too high.
If you are going to fit a switch use one with a light in it then you can see when you have it switched on or when the fan is triggered by the thermostat.
In my installation the light is connected directly across the fan so it indicates whether the fan is receiving power, not when the relay has been told to feed it power...If you are going to fit a switch use one with a light in it then you can see when you have it switched on or when the fan is triggered by the thermostat.
Above about 70mph the fan windmills enough to generate sufficient juice to light the lamp. I have a Vonhosen light
Had a quick look round my car and I have tried altering the settings on the ecu for the fan and this does do anything. Looks like the is a temperature switch in the bottom of the rad the must be a bimetallic strip that triggers the fans but theyt do not activate till approx 94 deg c, but this doesnt seem to have a relay in the circuit and I have traced it all the way back to the battery.
Figures. You need to add a relay to the circuit, and a good hefty one too, at least 40A rating. Then wire both the manual switch and the radiator thermostat to control the fan via the relay. You never know, you might then become one of the few people who doesn't have the radiator thermostat fail.
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