I didn't follow up on your last post but I see that you found and fixed the charging problem. Reading through this post I was thinking that you need to check the OVP relay again. It's a good thing you held onto your old one, eh? Defective new parts are a *****. The worst one I remember is a new distributor cap that was installed on the president of the local Mercedes club's S320 . Went all of a mile and a half and completely failed. Missed being able to deliver the car when promised b/c of all of the time spent checking everything else first.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff