FINALLY GOT IT! First determined no water going to pump by viewing inline glass strainer which lead to no H20 in tank which I was wrong abt. After filling fresh H20 tank, turned pump on & dead silence until toilet was flushed, pump started & stopped as normal !! Just like the result of 99.9% of airplane crashes- human error ! On a similar note a day earlier the toilet stopped flushing. Determined that to be a full black tank even though the new gold plated headhunter tank sensor was just installed & supposedly calibrated indicated 30% full!! Wkend work never ceases. Thanks guys for your input. Hope this helps someone else.