Join Date: Nov 2006
Location: Moses Lake, WA
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To properly test the glow plug relay. Hook the positive clip of the volt meter to one of the big terminals on the relay, and the negative clip to the other big terminal on the relay. With key off it should read battery voltage, when you turn the key on and the relay activates it should drop below .02 volts. Doing this measures the voltage drop across the relay. If it is above .02 volts replace the relay. When checking the glow plugs use Ohm meter. Connect the negative side to the battery ground. then probe the glow plugs they should all read about the same ohms. less than 7.
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