Hello Mike,
I was just looking at the schematic for the Bravada, and they offer two different types of radio. One with an external amp, and one without. If you have the radio without an amp, I didn't see any amp signal wire. If you do have the amp version, the amplifier signal wire is green, and is coming out of terminal f3 at the back of the radio. It sounds to me like you have the non-amplified version. You may wan't to ask a radio install shop how to signal an aftermarket amp with the factory head.
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Russ
What I was saying is that the Bravada comes from the factory with two different options. One with an external amp, and one without. If your truck didn't come with the factory amp, then there is no amp signal wire for you to tap into. That is why I'm suggesting going to a radio install shop and find out what they do to hook an aftermarket amp to a factory radio.
Yes there is an ignition feed, but I thought you were looking for a dedicated amp signal wire. Here's the schematic for the non amplified Bravada. The reason I was confused as to what you wanted is, when aftermarket radios are installed, they usually have an amp signal wire which turns the amp on only when the radio is on. The way you are describing it, your amp will be on all the time when the ignition is on.
ASE Certified Technician
19 years of GM Dealership experience. ASE Master with L1 and GM Master Certified in Electrical