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for a quick check on the ground connection from chassis to the engine use a voltmeter with one end connected to the ground cable connection on the body and the other on a clean metal connection on the engine.Crank the engine without waiting for the glow plugs,that way it will crank long enough for you to get a reading on the meter before it starts. A significant reading on the meter is an indication of a poor connection in the ground circuit.you can then narrow it down by moving the test lead to either side of the connections until you find the one(or more) causing the drop. My $.02 Don
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Red Green "This is only temporary,Unless it works!"
97 E300D 157000 miles
87 300TD ?141k? miles
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