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If it blows immediately after turning the fan on, there must be a short. If it takes a few seconds, the motor could need to be oiled, unrestricted (if something is stopping the squirrel-cage from turning), or possibly replaced. Don't go with a larger fuse; you'll burn up the wiring.
What you have done? You Just damage the TCCM and that's why you will not manage to shift 4x4. Why this happened? Because you had shortage somewhere and you receive blown ATC fuse.You put a bigger fuse in capacity where the was stronger to blown and the fault moved to the tccm system which was not protected and blown.Ask for an expert to check and see whether the fault is easy to get fixed.
This would be like looking for a needle in a hay stack, the right way would be to get a wiring diagram showing wiring from INT BAT and tracing the wires to make sure if its not short to ground. And dont put fuse more then 50amp or else the wiring will melt and you may have fire.
check your grounds & the fuel pump connections.the ground should run to the right rear of the motor. look at the wires back to the motor on the frame for anything that may have nicked a wire or a rub thru. You have a short and i belive it shut down if you hit a bump. loose or fraid wire some place. Best of luck & keep us posted on your fix.
Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!
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