The starter won't do anything when you crank the key. The glow plug relay buzzes and it's like shutting off all other ignition or that's what it seems like. It does have symptoms of a weak battery, but even when the 55amp booster was put on it, it was the same way. It has been a while since it was started, about 10 months maybe a year. But, it's always had the trickle charger on it. Also, when the battery charger/booster was on it, it showed the battery was fully charged.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.