I have a LS P7010C that has an interesting problem. Turn ignition on, radio comes on. Turn on hvac blower, or lights or any other accessory and it turns off the radio and no longer has positive voltage to the hvac/radio/lighting fuse block. Does anyone have wiring diagrams or an idea where to start? I already tore out the hvac harness and checked it for shorts. None found and with stand alone power the blower worked fine.