i took out my subs a couple months ago and left the amp in and i recently had my cd player changed since my last one crapped out. anyways, i noticed they forgot to hook up the amp wires to the new cd player, so i figure its no big deal, its just two audio wires that i have to connect to the (sub out) on the back of the new cd player.. but i get no power to the amp. i checked and the amp has three wires coming out of it.. 1 is a 12 volt that is hooked up and the fuse is OK. 2. a ground wire that is properly grounded. BUT numero 3 is a thin blue wire that goes all the way to the back of the cd player... and is not connected... it is just laying there with no home. its simply labled REM.... so is that the problem...? i dunno.

yea.. that wire needs to be connected to your remote wire on your radio harness.. should be the same color.

Here's the thing. The blue wire is called remote turn on.
So head units like Eclipse/Pioneer/Panasonic/Alipne and couple more brands actually have amplifier remote turn on wire coming from wiring harness of the HU. Some dont, so if ur HU doesnt have that you can always hook it up to your power antenna which will either be blue or blue with white stripe.

^ all of the above yes, this serves as a purpose of turning off/on of the amps when the player or car turns off. prevents drainage of battery.

ok ima try running the blue wire from my amp to the power antenna. hope it works. thanks guys