Control Switch Test
- Check test light by connecting it to battery terminals and 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 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 original intensity, replace defective control switch.