OK. I've posted this before and thought I had it narrowed down to the starter but that's not it I guess.

When I go to start the 1984 300DTurbo, all I get is a "click" from inside the glow plug relay. I can do it (reproduce the "click") over a over again repeatedly and very quickly by not fully cycling the key back to the off position but rather very quickly jiggling the key in and out of the ignition position and sometimes the starter will go ahead and kick off. Used to only have the problem on hot days. Now it's all the time. New 950CCA battery, rebuilt starter. Still does it. I'm going to totally replace the battery cables today and see if that makes a difference.

I can generally always start it by applting more juice to it (battery charger or jumper cables)

Any new ideas? Why is the "click" repeatedly coming from the glow plug relay? Last night the starter wouldn't crank. Glow plug relay just made that &*$%ed "click". I unplugged the larger plug on the relay and tried to start the car. The starter engaged immediately but the car wouldn't start. Plugged it back in and the starter cranked again and the car started right up. I'm at my wits end and will probably shoot myself if the battery cables fix the problem.

Could something in the relay be drawing down the battery just enough to keep it from starting?

Help me or I'm going to have to take my 12 guage Weatherly to my beautiful black MB.

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'84 300D Turbo Black w/Tan (104k)
'94 GMC K1500 Z-71 (198k)
'96 Ford Explorer V8 AWD (178k)
'51 Ford 8N ( about 2000hrs)
'98 English Setter "Jade" (10k foot weary, bird finding miles)