Move the switch to the OFF position and measure the resistance. The multimeter must show 100k ohms or more (open circuit). If the circuit is not open, the switch has failed.
Replace the switch. Refer to the OEM troubleshooting and repair manual for the replacement procedures.
Move the switch to the ON position and measure the resistance. The multimeter must show 10 ohms or less (closed circuit). If the circuit is not closed, the switch has failed.
Replace the switch. Refer to the OEM troubleshooting and repair manual for the replacement procedures.
If the resistance value is correct, the switch must still be checked for a short circuit to ground.
Touch one of the multimeter probes to one of the switch terminals. Touch the other probe to chassis ground. Move the switch to the ON position and measure the resistance. The multimeter must
show 100k ohms or more (open circuit). If the circuit is not
open, the switch has failed. Replace the switch. Refer to the OEM troubleshooting and repair manual for replacement procedures. If the switch passes all of the previous checks, the circuit must be checked for an open circuit, a short circuit to ground, a short circuit from pin to pin, and a short circuit to an external voltage source.
Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.
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