I'd suggest a series voltage drop test, but it would take a week of pounding a keyboard to describe the procedure and I'd still be misunderstood. Find the high resistance connection in the starting circuit, (or the funky battery cable) or find someone who knows how to do that test.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!