SOURCE: 1989 Jeep Wrangler no power when key is in on position
Honestly, it sounds like a bad ignition coil. When they get corroded inside they will draw power on a scale much higher than anything else on the vehicle. It is a coil and it's job is to take a little power and make a lot of it. If it's only when the key is in the "run" position, that is likely the case. The only real difference between the two positions is that in the run position there is power being delivered to the ignition system. Good luck.
SOURCE: 95 jeep cherokee country 6 cyl auto. wont crank all the time
Sounds like a bad starter, why did you replace the crank position sensor? If the engine will not turn over at all and it sparks with trying to jump the solenoid with a screw driver it seem as though the starter is bad. First you solve the solenoid problem when you jumped the solenoid with a screw driver sending fire to the starter. Check the cable connections to the starter if they are good replace the starter this should fix your problem.
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