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Can you try this for me. Hook up just the ground cable with the jumper cables and see if the truck starts and then vice versa with the power. This can help out a lot in diagnosing the issue for if the truck starts with the ground, the ground cable is bad internally or at the ground point. If the power does it, then there will need to be more looked into for the starter is needing a lot of extra amperage to get it to crank. That can be the starter needs a different solenoid or maybe even a bad starter cable. The cable could be damaged or corroded internally and not allowing enough electron flow through the strands to give enough amperage to crank. Adding the jumper cable is like giving the electrons steroids and they will flow faster through the wiring.
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Yes, there is an inline fuse. It should be about 6 inches from the alternator. You also have another one between the 2 batteries as well.
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