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Your problem can be caused by a bad ground. Make sure the ground wire is tight at both ends...battery side and truck side. If you have a multimeter you can also test the alternator by starting the truck and running the lights and A/C. Your battery voltage should read 13-14 volts while the truck is running.
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2004 6.0 PSD CC Lariat FX4, Bulletproof Diesel EGR Cooler upgrade, Scangauge II, High Idle Mod, Tow Package, Air Lift Bags, 2006 Jayco Eagle 325BHS 5th Wheel
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