Without glow plug function on at least five out six, there's not much chance it will start. Also, regarding the main engine wiring harness, its eight wires , there may be a diagram for the engine wiring at k-jet.org. Haynes manuals for the 740 have a diesel engine wiring diagram. The sensor at the rear of the head is the temperature sensor for the glow plug system. A brown wire goes to it. This is also probably the best time to check all six glow plugs. You can get number six out by removing the rear timing belt cover and working gingerly from behind the head. Have a telescoping magnet ready to position the known good glow plug for reinstallation. Getting the tiny 8mm nut on glow plugs five and six to secure the bus bar isn't much fun either. Once you have verified correct timing, glow plug function and fuel, the only thing left is compression. Hope it won't come to that.
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