OEM Amplifier connection to aftermarket radio.

[mubmoh]

Hi,


I am trying to wrap my head around the wiring connection I need to make.

I have an aftermarket radio and want to connect my vehicles OEM amplifier. The vehicle is an Audi A3 8P. I have already achieved the vehicles speakers to function with the aftermarket radio.

I have attached relative images.

Here is the OEM information.

I have:
1 - Signal (+) (rear left) to amplifier with bass loudspeaker -R44- in luggage compartment (left-side)
4 - Switched positive to amplifier with bass loudspeaker -R44- in luggage compartment (left-side)
7 - Signal (+) (rear right) to amplifier with bass loudspeaker -R44- in luggage compartment (left-side)
10 - Signal (–) to amplifier with bass loudspeaker -R44- in luggage compartment (left-side)

I am unsure what a switched positive (4) is. Also why do I have 2 + connections and only 1 - negative? Does 1and 10 share the same negative?





This was the OEM wiring, J503 was my OEM radio which I have now removed, all those cables were in the connector mentioned above.
I have already successfully wired the CANBUS to the aftermarket radio (it switches on/off with ignition with no need for ACC).

I have been supplied an impendance converter by my supplier but here is where I am confused.



Is the car audio host my new aftermarket radio? Also I do not have RCA connectors for my amplifier, they are just regular wires.

Here are some additional images my supplier provided.




Thanks for any help!

[TEKNOPUG]

You need a left and right positive speaker wire connected from HU to Amp to act as the signals instead of RCA connectors.

Then you need a connection from the ACC from HU to Amp which tells the amp to turn on/off.

Finally it's asking for a negative connection that shares it ground with the HU.

Presumably the Amp already has it's own Live connected separately? If not, then it may want a switched ignition live from the HU but I'd suggest it should have it's own live. Pics and specs of the amp would help.

• * Is the amp purely for a single subwoofer?

Edited by TEKNOPUG on Saturday 1st July 18:41

[mubmoh]

TEKNOPUG said:

You need a left and right positive speaker wire connected from HU to Amp to act as the signals instead of RCA connectors.

Then you need a connection from the ACC from HU to Amp which tells the amp to turn on/off.

Finally it's asking for a negative connection that shares it ground with the HU.

Presumably the Amp already has it's own Live connected separately? If not, then it may want a switched ignition live from the HU but I'd suggest it should have it's own live. Pics and specs of the amp would help.

Edited by TEKNOPUG on Saturday 1st July 18:41

You're spot on. Got it working now, thanks for the assistance!

For anyone who ever has this issue and is looking for a solution, here is what to do:

In the image I supplied in OP, green is back left +, yellow is back right +, grey is Ant, and white is earth. Match these connections with your aftermarket unit and all should work.