help electrical problem!

I had forgotten the engine grounding strap when I bolted on the bell housing. Why it waited a several days I don't know but that's the funny thing about grounds. Maybe the strap was making contact and then fell away.

In this case,, the ground was prob being made thru a piece of linkage,, that would move when the engine torqued, making/breaking the circuit.. ask me how I know.. lol..