Gerhard
I recently had the same problem starting my M-18 Diesel.  It would start on the #1 battery, but not the #2.  I drove myself crazy checking and emery-cloth cleaning each connection between the Batteries and the 3 way relay switch with negative results.  Finally I just removed both Sears Marine batteries (still under partial warrantee), and purchased two new ones from Sears.  I now have no problem starting the engine.  Lesson...."Don't overlook the most obvious in search of another hidden cause"   Good Luck
 
Andy
Slow"MO"tion
1985 T/Rig  #6038
Nyack, NY

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