Quote:
Originally Posted by Zacharias
I.........
No. You want to measure the resistance by putting the red lead into each female receptacle in the large plug at the end of the harness that runs from the relay to the glowplugs. The black lead goes to a good ground, preferably the negative battery terminal if the lead is long enough. The engine block is NOT a good ground.
Before anything else, check that you can hear the relay engage when you turn the key to the preglow position. If you don't hear it click, try tapping it on the side or on top. Also make sure that the strip fuse inside the glow relay is intact.
|
Why is the engine block not a good ground? It is where the glow plugs are grounded so it better be a good ground. The engine block is grounded via the ground strap on the driver's side bell housing and if it is not making a good connection, it could affect glow plug operation.
BTW, measuring resistance is not polarity sensitive (unless you are measuring the resistance of a diode), where you put the red and black leads does not matter. You want to make sure power is off while measuring resistance otherwise the reading will be wrong.