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I want to hardwire the power adapter for my XM roady to the pre-wired cellphone wiring underneath my cupholder area. But it says that the included adapter is 6v. I'm assuming the cellphone wires are 12v. Will this cause any problems?

If it doesn't, I'm assuming all I need to do is grab the switched 12v wire and connect it to the power wire from the cigarette lighter adapter. Then take the ground wire from the cigarette lighter adapter and ground it.
Is this right?

Thanks!
 

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I believe the adapter converts the car's 12 volts to the unit's 6 volts.

Wiring into the phone harness is relatively easy, once you remove the console. Check for +12v constant, +12v switched and ground wires with a multimeter. All the wires are in that harness, so you don't need to go to the lighter.
 
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