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For testing glow plugs, I just used a little jumper wire from the positive batt post to the terminal on the plug. Then you just touch the lug to ground and check for glow. No need to cycle the system on and off that way. You can also use a multimeter to check them in the block. Set it to resistance or continuity. All 8 should be relatively close together. If you get one with 0 or low resistance, or no continuity "beep," than you have a dead plug.