Get a drill, set it to number 2 (fast speed) and a wire wheel brush. You can find them cheap at your hardware store, get a set and just go over the whole thing. Make sure to wear glasses as the small wires can fly off, and having that in your eye isn’t fun. For the Official Mechanic It’s Not Just A Job Title It’s A 2020 Survival Skill Shirt, any of the rust removers at Home Depot, etc work fine, mainly just have to let the stuff soak. For the larger parts since you can’t submerge them, try to find a thicker viscosity rust remover you can brush on to get it to stick. Plain white vinegar is apparently a very good rust remover. Soak it all in vinegar and use a wire brush to clean it off.
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Not cherry red but heat up the surrounding metal and it should come loose. Careful that penetrating oil will burn off and make some smoke. Use a chemical called Evaporust. Stuff won’t even hurt plastic or rubber parts but dissolves rust amazingly well. You can get it at a lot of the Official Mechanic It’s Not Just A Job Title It’s A 2020 Survival Skill Shirt. If you use it please post an “after” pic. Because you won’t be disappointed if you follow the directions. So it sounds like a bad starter. Either the brushes are worn out or caked over and losing contact, or an electrical connection in it has broken or corroded. There are parts available to rebuild those starters. Rebuilding the OEM part would probably be better in the long run.
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Then replacing it with an aftermarket product, since the OEM is probably higher quality than most replacements. Well, first, I guess to make sure you’ve got clean, shiny metal on the bottom of the bolt head and threads, Official Mechanic It’s Not Just A Job Title It’s A 2020 Survival Skill Shirt, and solenoid body where they all make contact. Third, check that circuit for a short to ground and/or voltage drop test it, breaking it in half. Or as many parts as possible along the way to find out where your voltage is going. Does the truck have the i6 engine? Also, I noticed in another comment that you have a no-start condition.