MarkTheBoy Posted August 28, 2006 Share Posted August 28, 2006 Urgent question... Just wiring in my new boost guage and want to route it through the dimmer control on the dash, Which wire do I tap in to, from the back of the dial to supply the 12v lighting feed to the new guage? There are 3 wires - Green & Orange White with thin green pinstripe White with thin black pinstripe Anybody know? Link to comment Share on other sites More sharing options...
hodge Posted August 28, 2006 Share Posted August 28, 2006 Use a current light. There really cheap only about a quid or so. Earth the wire onto the body work touch the pen in the connector anf find out which is live the do it again with the ignition on. The wire that is live when the ignition is on only is the 1 you want. Link to comment Share on other sites More sharing options...
SimonB Posted August 28, 2006 Share Posted August 28, 2006 You can't actually easily wire it so it will dim. The dimmer uses a variable ground. So one of the wires will always be +12V when the lights are on. One of the others will be 0V (i.e. ground) when the dimmer is on full bright. As you turn the dimmer this one will go up to +10V say, so effectively the difference between the two goes down. Unfortunately boost gauges only have 1 illumination wire. If you hook it to the +12v line the guage backlight will come on with your lights on but will always be full brightness. If you use the other one it will work backwards, so full bright on the dimmer will be dim on your gauge. Link to comment Share on other sites More sharing options...
Supra ST Myster Posted August 28, 2006 Share Posted August 28, 2006 green with the brown stripe is the switched +12V when your lights are on, if you want it to dim then i would tap the wire from the boost gauge to one of the 4 bulbs on the back of the gauge cluster that come on with the lights, Link to comment Share on other sites More sharing options...
MarkTheBoy Posted August 28, 2006 Author Share Posted August 28, 2006 green with the brown stripe is the switched +12V when your lights are on, if you want it to dim then i would tap the wire from the boost gauge to one of the 4 bulbs on the back of the gauge cluster that come on with the lights, So if I want it simply to illuminate then green and orange/brown is the one I tap into? Thanks all for your help, I reckon i'll settle with it simply being lit. Sod the dimming idea, it sounds a bit complicated for a monday night Cheers again Link to comment Share on other sites More sharing options...
Supra ST Myster Posted August 28, 2006 Share Posted August 28, 2006 yep connect it to the green/brown wire, you can also find this wire everywhere, ie going to the cig light, any switches you may have ie trac control active spoiler or the gauge cluster. white/black wire is the 0V Link to comment Share on other sites More sharing options...
MarkTheBoy Posted August 28, 2006 Author Share Posted August 28, 2006 Still have no illumination, I have connected the wires as listed in the instructions (see pic) I have connected the orange wire (12v lighting) from the rear of the gauge to the green/brown wire from the rear of the dimmer as mentioned before. I have then attached the red wire (12v ignition switch) from the guage to the white wire going to the ashtray light (as per guide http://www.mkiv.com/techarticles/boostguage/bg.htm ) and then connected the black (ground) wire to the green wire from the ashtray (again by the guide on mkiv.com) Where am I going wrong? Link to comment Share on other sites More sharing options...
Supra ST Myster Posted August 28, 2006 Share Posted August 28, 2006 i presume you are turning the key and starting the car and not just flicking the lights on?? sorry but have to check lol you got a volt meter? Link to comment Share on other sites More sharing options...
MarkTheBoy Posted August 28, 2006 Author Share Posted August 28, 2006 i presume you are turning the key and starting the car and not just flicking the lights on?? sorry but have to check lol you got a volt meter? Yeah I starting at and took it up the road tonight to make sure it read the pressures ok, I had the headlights on and had a torch shining on the dial because it was pitch black outside I have a volt meter that I can borrow from work tomorrow, what do I need to do? Does it sound like I have wired it right? Link to comment Share on other sites More sharing options...
Supra ST Myster Posted August 28, 2006 Share Posted August 28, 2006 does sound like its wired right as long as the instructions on the 2 leads for the 12v and ov are right, i wouldnt of taken the supply to the guage from there though, anyway, with the volt meter first check you are getting supply to the gauge by putting the probes on those 2 points and start the car, then if you are getting 12V, ground the black lead of the meter and put the positve lead on the wire thats for the back light, and check it goes to 12V when the lights are on, dont need to start the car for that, just switch on the lights. Link to comment Share on other sites More sharing options...
MarkTheBoy Posted August 28, 2006 Author Share Posted August 28, 2006 does sound like its wired right as long as the instructions on the 2 leads for the 12v and ov are right, i wouldnt of taken the supply to the guage from there though, anyway, with the volt meter first check you are getting supply to the gauge by putting the probes on those 2 points and start the car, then if you are getting 12V, ground the black lead of the meter and put the positve lead on the wire thats for the back light, and check it goes to 12V when the lights are on, dont need to start the car for that, just switch on the lights. Ok will do, thankyou for your help with this. I'll check tomorrow with the volt meter and post back here. Cheers Link to comment Share on other sites More sharing options...
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