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Dude, you got bigger electrical problems than needing a jump. (Suburban Dually??) This is one messed up electrical system. I assume you jump the engine correctly, negative to the dead engine's ground. When you disconnect the jump, it dies. I wonder if your battery is finding a good engine ground. I assume you cleaned the ground cable at the battery, how about the other end, at the engine. Undo this connection and ohm it to make sure you have good conductivity. Clean this connection, the cable and the post and nut at the engine. Do not add grease to this connection unless you live in a single wide trailer still on it's wheels with 27 members of your family. ( This grease inhibits oxidation, because it also inhibits conductivity.)
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