An easy way to test the glow plug relay is simply clip a light bulb across the glow plugs and watch. 4-5 seconds is not long enough if it is indeed so short. Search for posts from me where I talk about ways to test glow plugs without having to remove them.
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Originally Posted by siral3x
What is the procedure to test the GP relay itself?? I followed dieselgiant method by testing the pins for voltage, and there is 11.5v for 4-5 sec on each pin + at the glow plugs the voltage stays on for 4-5 sec also, no way near to 40 sec???
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