How do you test a glow plug control module?

To test your glow plugs, simply connect a 12-volt test light to the positive battery terminal. Then disconnect the wires from each of your glow plugs and touch the probe of the test light to the terminal of the glow plug itself (not the wiring harness).

How do you test a glow plug resistor?

Testing glow plug resistance: Turn on the multimeter and select ‘resistance’ or ‘Ω’ mode. Connect one multimeter test lead to a ground on the engine (preferably near the glow plug). Connect the other lead to the (power supply) terminal on the top of the glow plug. Read the result off the multimeter display.

How do I know if my glow plugs are getting power?

Observe if the glow plugs are getting the power they require by connecting a test light to the plug. If the test light lights up, the plug is receiving power.

The easiest is to check your glow plugs before testing your glow plug control module. To test your glow plugs, simply connect a 12-volt test light to the positive battery terminal. Then disconnect the wires from each of your glow plugs and touch the probe of the test light to the terminal of the glow plug itself (not the wiring harness).

Where is the glow plug control module on a Ford F-350 pickup truck?

Model year 1999 and newer 7.3-liter Powerstroke Diesel Ford F-350 pick-up trucks that meet California emissions standards have a glow plug control module instead of the more common glow plug relay. Both the relay and the control module are on the passenger side engine valve cover behind the fuel filter housing, with brown and yellow wires attached.

Where is the glow plug relay on a diesel engine?

Both the relay and the control module are on the passenger side engine valve cover behind the fuel filter housing, with brown and yellow wires attached. The glow plug control module or relay is responsible for turning the glow plugs on and off so that you can start your diesel engine when it’s cold.

How do I know if my glow plugs are bad?