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First post to the club, but a frequent user of the great advice you guys offer. Having a crank issue with a 91 4.0 Have power, but as soon as I turn the key completely to ignition I hear one click coming from the starter, the starter is trying to engage but then I lose all power and Can not keep trying to crank until I disconnect the battery and the reconnect to have the same thing happen. Things I’ve checked and or replaced: Starter Starter wires Grounds Ignition switch nss (completely replaced) all relays and fuses battery (used multiple different batteries to be sure) battery terminals and negative and positive terminal clamps radio and speakers (checking for shorts) Fuel pump ballast resistor map sensor and probably a few others that I’m forgetting Probably have about 25 hours in to this problem and I’m at a complete loss. Maybe I messed something up along the way so feel free to give any knowledge of common mistakes made during install or my checks along the way. I hope what I’m trying to say is clear and if not I can clarify