Mini_ash Posted May 21, 2013 Report Share Posted May 21, 2013 i need a switched 12v so i can wire in a hidden phone charger but far as i can tell my fag lighter is constant and i cant us my head unit since im useing it to turn on my amp Quote Link to comment Share on other sites More sharing options...
matt123roll Posted May 21, 2013 Report Share Posted May 21, 2013 Are you using a multi meter? There's plenty of switched power around the ignition Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 21, 2013 Report Share Posted May 21, 2013 (edited) Why don't you add a relay? Use (as in patch in) the head units switched live then use the constant from the cigarette socket?http://www.amazon.com/Absolute-RLS125-12-VCD-Automotive-Relay/dp/B0002KR9GGSurely that would suffice? You might want a base too as it just makes wiring in a little easier, although I know loads of people who have soldered directly onto the legs and then wrapped them using a tight heat shrink to minimize vibration wear.That's what I'd do personally. Wouldn't take long to wire in... what I will say is buy a decent charger. Spend £15 and buy a really high quality make. Don't use one of those Poundland jobs. Better still, if your head unit has a USB socket on the back (mine does) use a dumb USB cable. That would be the lazy way of doing it Edited May 21, 2013 by Skezza Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 21, 2013 Report Share Posted May 21, 2013 Add a bloody fuse in as well. Don't be a Barry boy!! Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 21, 2013 Report Share Posted May 21, 2013 Apologies, that Amazon link is USA.From eBay UK.http://www.ebay.co.uk/itm/4-Pin-Normally-Open-contact-MICRO-Relay-20A-/300796595195?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4608dfcbfb20amps is way way too much so you'd need to add a fuse as I said. Quote Link to comment Share on other sites More sharing options...
Mini_ash Posted May 21, 2013 Author Report Share Posted May 21, 2013 Are you using a multi meter? There's plenty of switched power around the ignitioni dont want to play around with my ignition Why don't you add a relay? Use (as in patch in) the head units switched live then use the constant from the cigarette socket?do you know how hard relays are to steal and if i use the remote turnon on the radio wont it stop my amp last time i tryed it just eathed out my wire and stoped it turning on Add a bloody fuse in as well. Don't be a Barry boy!!im going to be smart and use a 5amp unless can find smaller Quote Link to comment Share on other sites More sharing options...
harrysteele9 Posted May 21, 2013 Report Share Posted May 21, 2013 ever thought of using one of these just goes in to 12v cig lighter socket and it does the trick for me mateehttp://www.ebay.co.uk/itm/12v-HIGH-POWER-USB-UNIVERSAL-MINI-CAR-CHARGER-ADAPTER-/280718846555?pt=UK_MobilePhones_MobilePhoneAccessories_MobilePhoneChargers&hash=item415c25aa5b Quote Link to comment Share on other sites More sharing options...
Mini_ash Posted May 21, 2013 Author Report Share Posted May 21, 2013 ever thought of using one of these just goes in to 12v cig lighter socket and it does the trick for me mateehttp://www.ebay.co.uk/itm/12v-HIGH-POWER-USB-UNIVERSAL-MINI-CAR-CHARGER-ADAPTER-/280718846555?pt=UK_MobilePhones_MobilePhoneAccessories_MobilePhoneChargers&hash=item415c25aa5bim useing the insides of that just need to find power for it Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 21, 2013 Report Share Posted May 21, 2013 i dont want to play around with my ignition do you know how hard relays are to steal and if i use the remote turnon on the radio wont it stop my amp last time i tryed it just eathed out my wire and stoped it turning on im going to be smart and use a 5amp unless can find smaller I'm totally confused. How hard they are to steal lol? Is that a joke, they're only like £1.99 or am I getting the wrong end of the stick here lol. The remote turn on? Explain further. Quote Link to comment Share on other sites More sharing options...
harrysteele9 Posted May 22, 2013 Report Share Posted May 22, 2013 ok well dont understand what your trying to achieve here whats wrong with using it normally ? Quote Link to comment Share on other sites More sharing options...
Pete91 Posted May 22, 2013 Report Share Posted May 22, 2013 Why don't you make things really easy and take a feed from the battery to a rocker switch. That way you turn the feed on and off. Quote Link to comment Share on other sites More sharing options...
Skezza Posted May 22, 2013 Report Share Posted May 22, 2013 (edited) I completely understand what he wants, but I'm not sure he actually knows himself what and most importantly how... Also I think he's misunderstanding the electrical side of it....You want a switched live charging socket for your phone, but don't want to tap into the ignition wiring directly... That is fine, in fact it makes total sense.There are two easy ways you can do it:Tap into your head unit switched live. This is really easy, and you don't really need to cut any important wires. You just tap into the wiring adapter that you need to add when fitting an aftermarket HU. This is what I would do, as it's by far the easiest and probably the safest. Your head unit has a 10Amp fuse but I guarantee the current draw from your head unit will be a max 3amps. Very few will draw more and if they do, there is no way they are drawing 10amps. Tap in, ground somewhere, you have switched live.Alternatively, add a relay using the constant live from cig socket. That's a max output of 5a though.@Pete91Where could he take the feed from though? Wouldn't that make it an exceedingly big job? Edited May 22, 2013 by Skezza Quote Link to comment Share on other sites More sharing options...
Pete91 Posted May 22, 2013 Report Share Posted May 22, 2013 Nah mate you'd just need to remove a couple bits of trim, take a wire from the battery through the grommet into the passenger footwell and then to wherever you want the switch to be. If it was me if stick it in one of the blanks just above the cig lighter Quote Link to comment Share on other sites More sharing options...
Pete91 Posted May 22, 2013 Report Share Posted May 22, 2013 Either that or use the switched live like you said Joe. Either way you'll need to remove a few bits of trim Quote Link to comment Share on other sites More sharing options...
electricracer Posted May 22, 2013 Report Share Posted May 22, 2013 you should be using the head units remote wire (usually blue) to turn the amp on, thats what its for, you can still connect to the ignition feed to your head unit through a 5amp fuse Quote Link to comment Share on other sites More sharing options...
Mini_ash Posted May 22, 2013 Author Report Share Posted May 22, 2013 im going to try the head unit power and i dont really want to have a switch on show and everthing i have done so far is all hidden Quote Link to comment Share on other sites More sharing options...
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