Electrical problem
2004 Chevy Silverado V8 Automatic 215000 miles
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i just bought this truck and the radio and the door beeper both will work fine one time and then they cut out the sound cuts out liike all the wires going to the speakers are loose the local dealer said it was probaly the radio so i bought a new radio and it is the same way . i have a frien who has come to check it with a gm scan tool but it always works when he is here i dont know what to do next ?
thanks in advance for any help with this problem