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Hopefully not major but issues none the less. In desperate need of help.....I own a 2017 GMC SIERRA

install a sub and amp duo package with lp7 converter. Once 99% complete started truck everything worked. Turned truck off and connected power cable to battery. Truck now won't start all aftermarket lighting still works, key fob and alarm still work and one headlight strangely enough still works. truck is 100% unresponsive as far as rolling over or signs of life at all besides previously stated........ anything is a help at this point?????????  


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