dodge not starting

i have a 92 dodge ram 250 diesel and it just died on me ... so i took it in the shop and cant find out whats is going on ....i get no power when i turn
the key over nothing no lights nothing... i changed the ignition switch still nothing so i took to wires that go in to the switvch and hot wired it and got it to start and everything was running... then when i pluged it back in nothing but the light where the key ggoes in to the little led light is always on ... anyone have any idea what it may be
thnx Dan
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