- So im trying to replace my Headunit, two front dash tweeters, two front door speakers, and two rear speakers. - So i learned i would need a wiring interface to keep the features that come with the vehicle like OnStar, Factory amp, and like steering wheel controls. PAC RP5-GM11 Wiring...

Hi there, I'm working on my wife's '05 TrailBlazer. No sound from the speakers, but the radio picks up station info. It has the Bose radio and amp. Fuses are good, and speakers don't appear to be shorting. I was using a digital multimeter to check the speakers from the amp harnesses yesterday...

With the radio off and key out of ignition: 1. Is the Bose head unit supposed to turn on the factory Bose amp turn on lead when the truck is unlocked with the keyless entry? 2. Is there supposed to be a turn off delay? I used the factory turn on lead to power up an aftermarket amplifier. We...