I had a similar problem with my 2001 F350 Diesel. It sounds as if you have low battery voltage. The click you are hearing is most likely the starter solenoid. I would start by having the batteries tested. A common proplem with these vehicles is the solenoid that turns on the glow plug. If this solenoid fails it keeps the glow plug on continously and drains your batteries. I doubt if this is your problem since it sometimes starts. The batteries can test good with a volt meter but go down under load. Have them tested with a load tester.
Oh there is no ignition system on a diesel. The heat of compression lights off the fuel. If it cranks (spins the engine), and has no mechanical problems causing compression loss, it has ignition.
My parenthesis were not meant as a talk down. I spent many years as a tech rep and am aware that sometimes terms are misunderstood.
Hope this helps.
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Thursday, June 28th, 2007 AT 4:05 PM