if they are both after market, grab a harness so u dont need to chop wires. from there, wire BOTH units harnesses together
Do you wish to have both on @ the same time or on at differant times?
1)If you decide if you want to run both seperatly (one on as the other is off)
-just wire both of them together and just solder and make sure the connection is solid. the catch is if you incase you turn both on, it will pop the fuse that runs the factory line.
2) to have each decks functional and running simultaniously
- connect all wires from the harness EXCEPT the switched 12v.
grab a relay and connect it up like so.
85 - 12volt switched from factory harness
86 - Ground
70 - High current 12volt fused (add up the fuse ratings of the 2 decks. Eg deck 1 - 15amps deck 2- 15 amps) your fuse rating you should use is 30 or 25 amps.
30 - To the 12volt switched to the Deck harnesses.
place a diode across terminal 86 and 86. white stripe (cathode) on 85.
that will prevent any fuses to pop. as the constant 12 is only there to hold memory for alarm clock etc.
Last edited by Tedmond; 12-25-2007 at 12:02 PM.