Are they clean and tight? You just replaced the battery? Did you clean the posts w/emery cloth or a wire brush, and do the same to the inside of the clamps, before you put the clamps on the posts?

You checked the ground strap from the bell housing to the frame, but how about the one from the battery to the inner fender?

Are the clamps firmly affixed to the cables at the battery? Check the hot wire to the starter? I've had the POST (stud, call it what you will) on the solenoid that serves as the connecting point for the hot wire from the battery work its way loose before. DISCONNECT THE BATTERY BEFORE YOU TRY DOING ANYTHING AT THE SOLENOID END!!!

Jay.

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er