won't crank , car goes dead, 12.7 volts in battery on 1994 Lincoln Mark VIII

1994, 150k, car dead yesterday, replaced corroded negative terminal, jumped it, ran it, turned it off, dead, won't take a jump, 12.7 volts in battery.

Asked by for the 1994 Lincoln Mark VIII
When tring to junp start do you have lights ect? Does it try to start at all click or anything? Check battery cable ends, still not making connection either at the post or to the cable itself!! Repair ends aint hitting on much as far as a real fix.
Check where cable goes into the clamp again. I think it is a connection problem rather than the starter.
Thats it, replaced a cracked negaive and spruced up the positive , re-tightened them both. Car fired up.