The main purpose of the switch is to allow the operator to safely engage the ignition system and activate the electric starter. The ACC wire needs to be connected to car igniton. The accessory lead wire energizes other vehicle accessories, such as the radio, when the ignition is turned to the ACC position. Sadly that was too simple - most radios now have multiple 12v feeds, but it is very rare to have a switched 12v feed - they now rely on a computer to turn them on, the computer communicates over the CANBUS. Hi, the best place to take a feed for this is from the thick black/yellow wire on the back of the headlight switch. As per the instructions, the bluetooth module's 12V wire needs to be connected to an ignition switched 12V wire from the car. I have everything connected right - however there is one wire from the new radio's wiring harness that doesn't have a match on the old one. I've followed that yet when I switch the engine off, I lose all my presets. I want the stereo to come on when the ignition key is in position 1. All the wires have been matched up except that one. The ignition switch in a motor vehicle is the main electrical component used by the operator to start, run and turn off the vehicle. 5. It could also create a risk of fire if the fuse for your unswitched source is too large for the wiring of your switched source. 0. susie-4964 Posts: 23,143. 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). Sorry – as Luke said, I think it’s a bad Idea to use the Switched live (ignition wire). The old radio only had a constant power wire which I attached to it's match on the new radio. Getting it from fuse box would be my last option. 9-SPEAKER RR+. If you find two more wires that show approximately 12V, then turn the dimmer switch down and check again. here is the factory wire diagram colors from the Olds manual. 1-+12 VOLT IGNITION WIRE. In the good old days there would be a 12v Feed and a switched 12v Feed. I believe the 12 vdc constant power is just to maintain memory and clock type functions. With pin 8 being the earth, pin 6 being the dashboard illumination feed to the radio, and pin 5 being the radio switched 12V feed to the aerial (and also goes back to the white wire feeding the lights on warning buzzer in the RS2). 2004 Chevrolet Silverado Stereo Wiring Information. 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). 07 Jan 2011, 19:58. Jul 17 2012, 8:19pm. 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. 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 . The ACC wire offers power/electricity only when you insert car key into ignition switch and turn it to the left. 10-SPEAKER RR- 15-SPEAKER LR+. Lol, theres little to none. This car has no switched 12v wire in the harness, forcing me to tap into the cigarette lighter for that switched power source. 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). 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. Use the diagrams to properly match each with its appropriate wire from the car. Open the harness and you'll see large gauge wiring and look for the black/light green. That unmatched wire is labeled: 12v ignition/switched power. So you should get 12v then it drops when you crank then when the car is running it should be 12v again. Ignition hot wire location. 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. Jupiterimages/Polka Dot/Getty Images. User Name: Remember Me? The car radio 12 vdc constant was switched with the 12 vdc key switched power. Multi-pin connector 4, 12-pin, for CD changer control and CD audio input signals . Thread Tools: January 26th, 2006, 06:22 #1: EllisD75. Im installing a Nokia car kit CK-15W on a 2003 Vectra C, standard radio. 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 I can't find a radio wiring loom diagram anywhere, even an image. Link to post Share on other sites. How to Wire an Ignition Switch by Michelle Schaefer . 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. Step 3: Connect the starter relay wire The starter relay wire needs to be connected to the Start terminal located on the ignition switch. Radio Ignition Switched 12V+ Wire: Black/Blue Radio Ground Wire: Brown Re: Bugging you guys again about stereos!!! Newbie . kennyboy 0 kennyboy 0 I'm new! SOURCE: Need to know what color the 12V ignition wire. Ignition/Switched 12v wire? I have tried finding a feed from the hazard switch and the graphical computer to no avail. 12 Volt Universal Ignition Switch Wiring Diagram from www.ford-trucks.com Effectively read a electrical wiring diagram, one has to find out how the components within the system operate. The wire that shows less than 12V at that point is the dimmer/illumination wire. The manual says to connection both (from the radio) together and straight through to the permanent if you want it to be 'always on'. I am looking for a 12V power source that is integrated with the key ignition. Posted 16th Mar 2011. when the car ignition is turned off all power is lost to stereo not even enough to remember the code, can this be sorted if the stereo has a constant live and not having a remote live off the ignition? Jul 17 2012, 7:55pm. Ignition hot wire location. 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 Aug 8, 2009 at 11:47 AM #2. sdgd711 Full Access Member. You will need to add an appropriate fuse at this point as well as the circuit is 30 amp rated. Interference is either radiated - that is, picked up by the aerial - or conducted to the set by its own wiring. I can run the stereo fine, except the stereo only works when either the engine is running, or the ignition is in position 2 (Dash board information lights are all on). When you probe a wire that supplies 12v you know you have found a constant 12v … TEST THIS WIRE WITH YOUR DMM. 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 12v feed would keep the memory, and the switched feed would turn the radio on/off with the Key. Hello All, Can anyone point me to a source of 12 V ignition switched source near radio harness? I have perminent power fine, but when I turn the ignition on 12V isn't appearing across the switched wire and the ground wire. The fuses are all intact, and I have no idea where to go next! Describtion of 12V battery(+) wire: The 12V permanent battery wire will always offer power/electricity when the vehicle is turned on or off All the other switched circuits are too sensitive to carry additional loads of any size. one that is only live when the car's ignition is on (or is in the 'accessory' position, which not all cars have). I'm no longer trying to directly wire it to the battery. 14-SPEAKER LF-2-GND. The antenna wire is much thicker with a metal head and can be connected separately before you install the stereo. vinylandtrinkets 15. 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). i am assuming that one of the wires from the factory plug switches a relay inside the factory deck to turn on the 12v. I am not looking for the accessory electrical source which remains on for 20 minutes after turning the car off. Spin This is not advisable, and is almost certainly not what you want. Jump to Latest Follow 1 - 6 of 6 Posts. For example , if a module will be powered up and it sends out the signal of half the voltage in addition to the technician would not know this, he'd think he offers a challenge, as he would expect a new 12V signal. There are several checks you can carry out to trace the source of the interference. Share this post. The 12 volt constant power wire is usually yellow or blue, though it may be a number of colors coming from the car. 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 Once the multi-meter is grounded, ensure that the ignition switch is in the "off" position. any idea how to do this? Thanks in advance. I use the removal of the head unit face to switch the unit off, and fit it to turn on. 2006 Chevrolet Silverado Stereo Wiring Information. 2.Wire name: 12V battery(+) Color: Yellow. You should have 12v in ACC and Run ONLY. Join Date: Jan 2006. 4 +12v constant from battery 5 Remote for antenna amplifier etc. The rest of the harness wires are for the speakers. 3-+12 ... 10 – Telephone mute (mute switch for radio) 11 – Telephone audio input signal left, positive. The standard wiring arrangement is to have the ignition switched 12V feed going to pin 7 and the permanant 12V feed from the battery to pin 4. The car uses a CAN-BUS digital communication protocol, which transmits, among other things, ignition status of the car. 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). I believe I saw somewhere that this is found at the fuse box and not at the radio wiring harness. wiring a car stereo and avoiding the ignition. I am wondering how to add the 12v ignition to the aftermarket stereo? Electrical Question - Switched ignition wire in stereo wiring loom? The red wire is designed to be connected to a 'switched' 12 volt supply i.e. Where is everyone tapping into for the remote turn on while keeping the stock radio? 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