There are ways to bench test it with a propane torch and a fluke meter but if you have gone that far you may as well put a new one in and be done with it.

A gun in the hand is better than a cop on the phone.

98 Passport 33's, Supercharged, Calmini Bumper, rockbars, diff drops, Teralows, 4.77's, Aussie and ARB lockers, Safari snorkel, Optima red top.