ok, so im wiring a new HU into my 06 coupe with the bose system so i bought the metra 7551 harness. i only need to know

1 where does the blue power ant. wire go?
2 where does the black/grey amp ground go?
3 do i need to ground the black ground wire of the metra harness eventhough my HU's harnesses black wire is already connected to the chassis?
4 i have 3 other accessories for my HU that all need to be connected to a constant power source. can all 3 be connected to the same yellow wire of the metra harness?

im pretty sure these are noobie questions but its my first install. the radio shop wants 125 for the HU install then 75 a piece for the 3 accessories.

 

#1 if the harness doesnt have one then its not used. cap it off
#2 to the black ground on the harness
#3 yes ground everything at one place. multiple grounds will cause a ground loop
#4 depending on the power drawn with each of those modules yes and no.

 

#4. 1 is a lockout bypass, 1 is the bluetooth adaptor, the other is a PAC swi.

the BT has a 3amp fuse, the pac has a 1amp fuse, and the lockout has none

 

should be fine then

 

my radio reception was poor after install. i called metra and they said to wire the blue amp ground to the blue/white remote amp wire.

 

you said nothing about a blue amp ground wire. you refering to the blue power ant. wire?
does the radio you put in not have a power ant. wire from the harness?

in my 16 years in car audio ive yet to see a blue amp ground wire in any harness

 

sorry i meant to say the blue pwr ant wire and the blue/white amp remote wire both go to the hu's blue/white amp remote wire.

 

ya the gs have powered ants. the radio you got didnt have a dedicated power ant connection?

 

Where do the RCA cables go?