Control Switch Test
- Before starting test, check test light by connecting it to battery terminals. Note light intensity.
- Before starting engine, detach ignition harness electrical connector from heater control switch.
- Connect test light to load (choke) terminal of control switch and to ground.
- Start engine and allow it to reach normal operating temperature.
- Apply 12 volts to ignition harness terminal of control switch. If test light does not light or have the same original intensity, replace defective control switch.