Testing a spark plug wire’s ohm resistance with a multimeter is a good way to verify they are in working condition, and if the wires are capable of delivering the required voltage to the spark plug.

Attach the spark plug to a spark plug tester, then connect the tester to the ignition wire. Start the engine and observe the ...

Learning how to test glow plugs ensures your diesel engine remains reliable and efficient. Here is how to test glow plugs.