I need a 12 volt switched power supply for my sirius radio, where cani find a wire i can hook into?

i would test it even if you go with an aftermarket radio you will have to have all your power and grounds.to test it simply pull the radio out to get the the wires.The red wire is a 12 volt ignition when the key is turned on it sends 12 volts to turn the radio on,the yellow wire is 12 volt constant it should always have power on it.,and finally the black wire is your ground the easy way to test the ground is to simply take a test light and hook it onto the positive post of your battery prob the wire and make sure it lights up.To check for power just do the opposite hook the lead on the light to the ground post on the battery.you may have to have a wire ( a jumper wire) to use to hook in between the battery and the test lead on your light.

Confirm power is availible at starter main power supply, step one , using mutl meter check for 12 volts at battery positive terminal , 2, check main voltage supply lead to starter from battery pos post , 12 volts present? yer check voltage supply lead from battery pos post to altenater , then to starter , 12 volts present, yes , check small wire to starter at starter for switched 12 volts present yes change stater after confirming suitable ground, no, trouble shoot ignition / starter switch in colume

Usually your cigarette lighter is what is used to power the radar detector. If you want to add a 12 volt power port then you will need a multitester and check for a hot fuse on your fuse box that is not hot when the ignition is off, and wire your 12 volt power source into that.

take the inner door panel off, then jumper 12 volts to the motor connection, ( the one leading to the motor once disconnected ) to see if the motor even still works, if you hook the wires up backwards, no problem, Just reverse them to make it travel the other direction. if you find that the motor to the window works, back track to the switch, make sure its getting power with a meter or 12 volts test light, if it is,, push the switch to make sure its crossing through the switch supplying 12 volts to both sides, ( these switches are a normal pass through 12 volt switch, the only difference is the last 2 wires leading to the door side, flip flop, which makes the window go up or down) if you have voltage to and through the switch,, your window should work, ( assuming the motor checked out ok ) if wither of these 2 things doesn't check out good, replace them,, ( motor or switch) if you find that the switch isn't getting power, trace it back towards the drivers side switches,, and check the window switch lock, if thats shorted none of the other windows will work, and it would need to be replaced,

This vehicle does not have a switched power suppy in the factory harness. The orange wire in the car harness is a constant 12 volts.
To resolve connect the 12 volt power supply from the head unit to a switched circut at the fuse block and this will resolve your problem.

Same problem here. I took and hooked a jumper wire from +12 volts controlled by the key switch to the small Gray wire coming off of the dashboard plug. This supplies +12 volts directly to the illumination circuit. Don't know what will happen in the future, but my dash, radio, sic, a/c lights all work.

The antenna wire, witch should be yellow. is not supposed to be hooked up to 12 volts. It is only meant to be used as an on censer . If that wire is the reason your speakers are not working then the stereo is defective. That wire should have 12 volts coming out of it when the stereo is on. And hooking it to 12 volts could have damaged your stereo. I would look at the wire diagram again before doing anything else.

So anyway if you are not using the power antenna wire cap it off and leave it alone. you do not need it. Check all of your connections again and follow the wire diagram.
Good luck.

My manual for a 99 300M shows two sources of 12 volt power to the mirror positioning switch, One is from the battery, switch terminal 11 wire M1, PK (pink). The other is from the start-run 12 volt line, switch terminal 5, wire G5 DB/WT (dark blue, white stripe). If you send me your email address to af6im at arrl dot net I can send you a scanned copy of the diagram.

i supose the am fm radio just dosnt cut it anymore well lets give this a try . first u must disconnect positive battery cable so you dont short any wires . remove screws that hold in factory radio pull radio out a feww inches as no to rip out any wires.next you must locate positive 12 volt power supply wire usually red or orange .if not shure connect battry cable again and use a 12 volt test light by attaching the ground cable on the test light to a good clean metal bracket under dashboard or connect to a black groundwire with a screw into the steel under dash next probe the wires goin into the factory radio ur looking to find power 12 volts once you have found the correct power wire use tape and mark it this will be the power wire for your new stereo next u must figure out what wires for what speakers osually 2 wires per speaker 2 rear speakers and 2 front speakers meaning a total of 8 wires follw me so far ? now disconect car battry again so not to have sparks and cut or disconnect remaining wires speakers first label all with tape and mark front right front left rear left rear right there is a + and - the wire with the stripe on it is usually the + the other wire is the - being negitive ground . this operation is important in order for your fade ballance controlls to work properly now with your new cd player inhand look and see what wire is gonna be 12 volt most times its red with a fuse eg white plastic connector small fuse inside there it a must proper fuse to protect new cd player now there will be a black negative this will go to the matal ground area under dash close to where cd player goes into dash red to the orig taped 12 volt supply now ur spks one pos+ and one neg or common to each speaker now make all conections with stereo before you push stereo into dash you must hook up car battry leaving cd player hanging out so you can make wire changes if you wish on the speakers you need to use one pos front right or rear right + with one common or neg black - to the spkr the same common or ground or - whatever its called one common or neg can be used for all spkrs .good luck tape and solder all connections after you feel all is good im sorry this is all the help i can offer you be careful