2002 Cadillac DeVille - Dead electronics

, no interior lite, gas lid, truck lid buttons do not work ,windows head lites, do not work, car would not turn on unless use battery charger

Sound like a dead battery, have you done any checks on it??? Could also be loose and or corroded battery cable and or ends… Could be lot of things…

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First step, ask your shop for the standard battery/charging system test.