Glow plug relay was indeed broken and not turning off after 45 seconds.

Replaced and no problems thus far.

Will report back if anything else develops.

Thank you! Without the forum tip of looking at the relay Id be replacing an alternator and battery probably.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car