Symptoms:

When cycling glow plugs, the glow plug relay makes a whining/singing noise for maybe 5-10 seconds and then stops.

Car will not crank or turn over at all.

Tried jump starting but made no difference = battery is not the problem.

I replaced the glow plug relay with a spare, no differernce, same symptoms.

Any ideas on what wiring to check...?

Thanks in advance.

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1987 300SDL
2005 Ford Excursion 6.0L Powerstroke, 6" suspension lift