help with stereo wiring

Rich Optional

Asked by Mar 14, 2016 at 11:03 PM about the 2007 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

I have installed a new stereo system in my car.The radio works fine except the dimmer. That wire from what i can see on the after market attachment harness is not available. Metrax 70-5521 . Can anyone pleas tell me the function of the smaller connector and what the wires do? Thank you for helping

9 Answers


If you installed and after market radio and not a factory replacement,the aftermarket is not equipped for dimming,that is the wires to the left on the factory radio.

Best Answer

I ment to say the right.

Rich Optional

Thank you. On the smaller connector the one with white text under it. Do you know what that is used for?

1 out of 1 people think this is helpful.

Yes lighting and dimmer for the factory stereo,you want need it for the aftermarket stereo.

1 out of 1 people think this is helpful.
Rich Optional

The thing that has me baffled is the second connector 2 blue wires which are used to turn on an amp and another used for a possible power ant. along with 2 rca jacks.. The jacks stumped me. what could that second connector use rca jacks for.. I didn't notice any power amps in the rear on the car

Rich Optional

this is the connector i purchased instead of cutting the wires. I guess this could explain some of my confusion.

1 out of 1 people think this is helpful.

Yes, that is a mercury wiring harness for factory to aftermarket stereo.the one with coaxel is for amp,if your is equipped with it,other wise you want use it.

1 out of 1 people think this is helpful.
Rich Optional

Alright Thank you so much for your help.. Enjoy your evening

Rich Optional

The finished product. Thank you

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