Thanks, it is in and showing no signs of rejection, the patient lives!

I need to look at the alternator waveforms to see if there are any spikes which could have killed the other. Do that tonight. Still think it was heat however.

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)