XM Radio Roady

You should be ok to cut the part that plugs into the cig. lighter off and just hard wire the wires to switched power.  Be sure to see which wire of the 2 is the power wire and which is the ground.  the wire that goes to the middle of the plug is power (you might have to take the plug apart to tell) You can use the power from behind the plug if you want. (ingition wires would be better) 

BE SURE TO FUSE YOUR POWER WIRE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

make sure to check the polarity of the connector BEFORE you hard wire it in ..... also a lot of the cig lighter adapters are fused internally, so take it apart to see what amperage or milliamperage they fused it at and replicate this value in the fuse holder that you use.....

If you do not want to cut the plug off:  go to radio shack or something like it and buy a female cig. plug.  It should have 2 wires on it, one for power, one for gound.   Connect  these 2 wires to power and ground.  Run your wire from roady behind dash where you made these connections and plug the cig plug from roady into the new plung you just installed, tape all connections, and where the new plugs connect; or go to a stereo shop and have them hard wire it for you.  

 hope this helps

Get an inline fuse.  An inline fuse is made up of 1) two plastic "covers" that cover the actual fuse, and 2) the fuse itself.  The fuse itself is a tube like piece of glass which has a copper wire inside. The copper wire is made to "blow" if the current or amperes of the circuit get to high.  When the fuse blows, it breaks the circuit by breaking the power flow from the battery to the load, and in your case, it's the XM Roady.  Every fuse has a numerical rating which indicates the amount of current that it can handle before breaking the circuit.  A 5 AMP fuse can handle a current of up to 5 amps and so on.  Your fuse must be located between the power source and the XM unit, thus making it inline.  The two plastic covers that I mentioned before can be seperated for checking the fuse and installing a new one. 

How you wire it is up to you.  You can either run the power wire directly from the battery.  If you do this, you must install a switch after the fuse so the roady isn't drawing current 24/7.  That would be my last choice.  You could also splice the power wire into a wire behind the dash that only gets power when the key is set to "ACC" or "on."  And of course, after the splice on the wire that is going to the Roady, a fuse is needed.

Hope this answers a few of your questions