You can test them with an Ohm meter. Make sure all 4 have the same resistance or if no resistance then you've found the bad one(s).
youcannot test glow plugs thru the coneector on valve cover you need to actually test the glow plug
Test the resistance with an ohm meter.
This test will determine what glow plugs are working. ( It will not determine a partially burnt plug ). Disconnect the glow plug wires at the plugs .( You must unplug all of them for this test to work ) Connect a test light to the positive terminal of the battery. Touch the electrical connector at the end of the glow plug with the test light. If the light goes on the glow plug is working. Make sure you touch only the electrical connector on the plug. If you touch any other part (metal) of the plug the test light will light giving you a false reading.
The glow-plugs are located under the valve covers. There is a single wire that comes out of each injector harness that powers each glow-plug. Disconnect the single wire from the glow plug. Connect the gator clip of a test light to a positive and probe the glow plug terminal with the test light. If test light does not come on the glow plug is bad.
connect the ground end of a test light to the pos. side of the battery. now un hook the wires from the glow plugs or unbolt the terminals. after u have done this touch the tester to the glow plug terminals if it lights up it is good do this to all of them if the tester doesn't light up the glow plug is bad.
there are eight glow plugs.
no glow plugs
Glow plugs and injectors are two different parts of two different engines. You may be referring to glow plugs or spark plugs. If you have a diesel engine, you will have glow plugs. If it is gasoline, it is spark plugs.
Yes, all duramax's have glow plugs.
where is the glow plugs on a fiat multipla
IIRC, the 5.9 Liter Cummins uses a glow grid, not glow plugs. It is mounted right in the intake line after the turbo charger. Disconnect it, turn the key on, and see if it gets hot. Jim