Quote:
Originally Posted by dj1111
The car isn't mine, it's a friend of my son's. She had it over to my house again briefly tonight and I did a light bulb test on the wires going to the fan. Would not light the bulb. I tested the bulb by connecting directly to a full 12 volt source and it lighted bright. So back to my original question. If I'm getting the full 12.** volts (heater fan control at high) with a digital meter but so low amperage it won't light a 12 volt bulb is this an indicator that it's the resistor?
Thanks
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If the vehicle has the maunal blower speed control the resistor/relay module is defective in most cases. removal and inspecting this module you can check for open resistance runs/circuit with an OHM meter or just looking at it if very much damaged . these OEM style are very much damaged. with an older higher mileage vehicle the blower motor can cause a resistor / relay control module go bad in a short period of time, this would be from a higher current draw with a bad motor with shorted windings or bad bushings on the armature shaft.
since it operates with the 12volts good and smooth this is the resistors/relay module. I had to replace mine . just make sure the fuses are good .