Questiondoes a stock sterio have pre outs for a amp?.1500,crew cab
AnswerNO, and you have to be very carefull, there is data and current on the audio cable, any hi low interface is not going to work ,
you need this interface to add any aftermarquet amplifier , you will get the rca ouput jacks and
the remote turn on output
http://www.oemautosound.com/c-135-gm-chime-retention.aspx