w124, 1994 Wagon w/Electrical Gremlins?

[dickmac]

A cry out for help from a w124 addict! Crazy symptoms...total stall on highway a week ago during idling at stop light...battery totally dead, replaced old battery with new, checked alternator and is working within specs. Normal driving for one week and today same issue returned. Started the vehicle in below zero (-6f), allowed to idle for ten minutes, returned to vehicle and engine stalled with battery dead and unable to start. Clicking noise from relay box quite pronounced but I believe this to be normal. Any suggestions where to look now? Thanks, in advance, for taking the time to reply.