hardwiring sirius radio

hey gang, i'm needing a little help hardwiring my brother's sirus sporstster plug-n-play unit into the vehicle.  I've hidden all the wires, and i've hardwired into the deck, but what i wanted to do is hardwire into the power system with the cigarette lighter cord.  I was going to tap right into the cigarette lighter power and ground.  My question is, after cutting the lighter adaptor off, how do i determine power and ground on the lighter adaptor wire?  Thanks in advance!!

the center pole popping out of the cig adapter is positive, and the pieces around them are the ground. Hope this helps?99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)

Make sure that the cig. lighter plug is not also a voltage step down. A lot of these Sat. radio tuners run on 6 or 9 volts. It should say in the owners manual or on the plug itself.There is no such thing as free installation!

yes, that reminds me, I needed to purchase a female cig adapter, and hardwire that inside the console, and wire my mothers XM into that because the default plug is adapted to 6 volt, and that way it can all be removed also. good luck :)99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)

Most Sirius radios are 12v so the end does not need to stay on. It will say on the unit what the voltage input is, also in all of the Sirius units that I have worked with the positive wire is the one with the white line on it

ferretvw wrote: Most Sirius radios are 12v so the end does not need to stay on. It will say on the unit what the voltage input is, also in all of the Sirius units that I have worked with the positive wire is the one with the white line on it

i was going to say the same thing, ive found the white stripe as positvie always