I have the alpine cdm 7874 hu in my regular cab f150. I want to put in two more speakers in the rear since it only has two up front. I looked behind the hu and cant seem to figure out how to hook up the speaker wire. How do i hook up the speaker wire?

 

Anyone?

 

If you look on the back of the HU, there should be two sets of speaker leads for the rear speakers. They will be purple, purple/black, and green, green/black. The ones with the black stripe are negative, the other is positive. Run new speaker wires and hook it up.

 

Theres no speaker leads that i can see only 6 cd changer port and rca cable port then the harness but no speaker leads.

 

Coming from the harness there are no purple and green wires???

Should have, at the minimum, red, yellow, black, two whites, two grays (fronts) two greens and two purples (rears)

 

Ok so i looked at the back of the hu and i see the grey and white purple and green. It goes from the hu to a block where the wires go into a harness and go somewhere under the dash. So do i tap the green and purple wires?

 

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Yes, just tap into the purple and green wires. You can see from your picture that those 4 wires are not hooked to anything in the factory harness. You can just tap into those wires where you spliced the Alpine and aftermarket harness together.

 

So should i tap it with speaker wire or?

 

No, rope.

 

Funny guy, all right ill try that.