new to forum, and first gmc. 08 sierra . have problem similar to H E I pg10. Truck will not turn over. inside--no instruments work,no radio,dome light,direct indicator,or 4 ways. only heater fan runs.all lights function outside including direc and 4 ways,warning light all on on dash incl.security. tried the reset nothing. key off and out ,heater still running .batt at 13v Tried all key on off nothing. Dealer ABSOLUTELY no help change this change that no? keep changing.cant test anything no money back if not work,do not have money to throw away. VERY frustrated. Never saw answer to H E I post or others with similar problems .Can ANYONE help?