Success! Battery is charging properly now with new custom cable from alternator to X12/3 terminal. I'll install a more permanently routed cable with proper friction tape later.

I guess this is a lesson for W210 owners - clean out those drainage ducts right after the fall season!

__________________
Scott C.

2006 E320 CDI (120k miles)
FOR SALE: 1998 E300 Turbo Diesel - Black w/Tan Leather - Euro delivery (236k miles)