The idea behind the switched live is that you can’t accidentally leave the head unit on, while the always live retains the head units settings (tone and radio stations). Use the diagrams to properly match each with its appropriate wire from the car. TEST THIS WIRE WITH YOUR DMM. Thread Tools: January 26th, 2006, 06:22 #1: EllisD75. I just recently got a 2009 Silverado z71 LT3 package with the Bose system and was wanting to put my amp and subs in, but there are no ignition hot wires. i am assuming that one of the wires from the factory plug switches a relay inside the factory deck to turn on the 12v. The 12 volt constant power wire is usually yellow or blue, though it may be a number of colors coming from the car. Radio Constant 12V+ Wire: Orange Radio Ignition Switched 12V+ Wire: Class 2 Serial Data Radio Ground Wire: Black/White Radio Amplifier Trigger Wire: Pink Left Front Speaker Wire (+): Tan Left Front Speaker Wire (-): Gray Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Dark Green Left Rear Speaker Wire (+): Brown The wire that shows less than 12V at that point is the dimmer/illumination wire. Radio Ignition Switched 12V+ Wire: Black/Blue Radio Ground Wire: Brown Re: Bugging you guys again about stereos!!! That unmatched wire is labeled: 12v ignition/switched power. You should have 12v in ACC and Run ONLY. Ignition hot wire location. 14-SPEAKER LF-2-GND. 2.Wire name: 12V battery(+) Color: Yellow. Step 3: Connect the starter relay wire The starter relay wire needs to be connected to the Start terminal located on the ignition switch. Password: Register/Join: FAQ: Photos: Calendar: Search: Today's Posts : Mark Forums Read: VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR). The wiring of the radio has an option of either a permanent connection or the ignition switch. Once you are sure that the ignition is off, proceed to probe the wires on the switched portion of the ignition switch (refer to figure 1 above). In the good old days there would be a 12v Feed and a switched 12v Feed. All the wires have been matched up except that one. Sorry – as Luke said, I think it’s a bad Idea to use the Switched live (ignition wire). User Name: Remember Me? Ignition/Switched 12v wire? wiring a car stereo and avoiding the ignition. Lol, theres little to none. This is not advisable, and is almost certainly not what you want. Car radio interference originates usually in the ignition system, the charging circuit or among electrical accessories. So you should get 12v then it drops when you crank then when the car is running it should be 12v again. All the other switched circuits are too sensitive to carry additional loads of any size. You will need to add an appropriate fuse at this point as well as the circuit is 30 amp rated. How to Wire an Ignition Switch by Michelle Schaefer . The ACC wire offers power/electricity only when you insert car key into ignition switch and turn it to the left. 1-+12 VOLT IGNITION WIRE. Interference is either radiated - that is, picked up by the aerial - or conducted to the set by its own wiring. Jump to Latest Follow 1 - 6 of 6 Posts. The rest of the harness wires are for the speakers. If you place a jumper wire between a always-on 12V source and a switched 12V source, you've now turned your switched wire into an always-on wire (with power supplied from your original always-on source). 6 Light switch signal 7 +12v constant from battery 8 Ground How it should be (ISO compliant): 1 Steering wheel control (later models) 2 Steering wheel control (later models) 3 Not used. Hello All, Can anyone point me to a source of 12 V ignition switched source near radio harness? 3-+12 ... 10 – Telephone mute (mute switch for radio) 11 – Telephone audio input signal left, positive. I've bought a Bluetooth module which connects to the AUX port in my B-Class W245 2005, very similar (if not identical) to this one. The yellow wire must be connected to a permanent 12 volt feed in the car (that is where 12 volts is supplied even when the car is switched off with the key out of the ignition). The main purpose of the switch is to allow the operator to safely engage the ignition system and activate the electric starter. I am not looking for the accessory electrical source which remains on for 20 minutes after turning the car off. If you find two more wires that show approximately 12V, then turn the dimmer switch down and check again. Thanks in advance. 9-SPEAKER RR+. Jul 17 2012, 8:19pm. Aug 8, 2009 at 11:47 AM #2. sdgd711 Full Access Member. There are several checks you can carry out to trace the source of the interference. vinylandtrinkets 15. 2003 Oldsmobile Bravada Car Radio Stereo Audio Wiring Diagram Car Radio Constant 12v+ Wire: Orange Car Radio Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Car Stereo Dimmer Wire: Brown The other "hot" wire from the car harness (indicated to be red) is also 12vdc but is "switched" through the ignition switch when actuated with the key. Once the multi-meter is grounded, ensure that the ignition switch is in the "off" position. The ignition switch in a motor vehicle is the main electrical component used by the operator to start, run and turn off the vehicle. I am looking for a 12V power source that is integrated with the key ignition. The ACC wire needs to be connected to car igniton. kennyboy 0 kennyboy 0 I'm new! Jupiterimages/Polka Dot/Getty Images. For connection to the car kit, on the radio loom -or adjacent to-where do I find +12v battery line Ground, car battery Car radio mute Car ignition sense Thanks for any help. Newbie . Hi, the best place to take a feed for this is from the thick black/yellow wire on the back of the headlight switch. Wiring guage for installing switched 12V for stereo/radio Polo ... the wire from the ignition switch is a Black/Red wire ( 1.0mm) pin 4 might be marked as "S" this feeds to fuse 19 5 amp and this leaves the fusebox as a Black/Brown wire (0.5mm) and goes to the Onboard power supply unit on plug 73A pin 42 . I can't find a radio wiring loom diagram anywhere, even an image. The red wire is designed to be connected to a 'switched' 12 volt supply i.e. Other vehicle accessories, such as the circuit is 30 amp rated 6 Posts, #! Fit it to turn on add an appropriate fuse at this point as well as the radio an. It may be a number of colors coming from the factory deck to turn radio ignition switched 12v wire! The key accessory lead wire energizes other vehicle accessories, such as the circuit is 30 amp rated type.. Operator to safely engage the ignition switch and turn it to the battery 3-+12... –... Tapping into for the Remote turn on switched 12v wire from the Olds manual i am how. 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