update:

today i was cycling my keys through, and stuck my head out to hear where the clicking is from. and it appears the clicking sounds is generated from the drivers side inner fender. i like to beleive it comes from the glow plug relay.

now what could have caused this? and how does it affect the starter not engaging?

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05