The battery likes to discharge. Another issue I will be chasing in the near future.
I had hoped to have less voltage load while cranking by disconnecting the glow plugs. This battery is nearly 5 years old now. I don't want to test it's "failure mode". New battery not in the budget. Maybe August.

snapped_bolt

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'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....