i have this LED and it has3 wires red yellow and black
RED: 12v constant
YELLOW: 12v ignition grounded when engine is off
BLACK: reg. groun
where would be a good place to hook up the yellow wire, if i just hook up the red and black the LED would stay on all the time .. so i wanna do it right. thanks

 

Yellow needs to go to a source of constant 12v. You can get this at the battery, fuse box, or ignition harness...

 

well the yellow wire is power when the cars off. and im not fimilar were to hook it up with somthing that has power with the car off.. thats my question .. what could i hook it up to?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote"> Yellow needs to go to a source of constant 12v. You can get this at the battery, fuse box, or ignition harness... </TD></TR></TABLE>

 

yellow need to go to ground. you could put a switch in so it'll turn on when you use the switch. other then that you can rig up a relay to switch ground on when power goes off.

 

if you have an alarm you can hook up it to, negative when armed output if it is a DEI alarm orange wireusually 1st pin to the right of the main harness ....

 

for mine. What I did was go to the fuse box, and look for place that was empty. Then took a test light, and hooked it up to ground, So when I turned the key on, I looked for a empty socket, that was Off when the key wasn't on, and then On when the key was switched to the on postion. And then used a spade terminal, (i think whats what it is, The one that looks like a 2 prong fork) and used that as the lead. Never had any problems, To be on the safe side, Run a fuse inline

 

why the hell does an LED need constant power? Is it going to "forget" something?

 

im pretty sure it works like this .. when hooked up the way they want .. the led stays off when the cars on.. and turns on when the cars off.. kinda like a turbo timer.

im probably making this alot harder then it is but i just wanted to see what would be the best thing to connect it to.. the red and yellow work in conjuntion like grounds.. idk

 

so you just need to connect yellow to an accessory or ignition wire by the sounds of it. The easiest option would be tag into the one behind your head unit.

 

thats what i was thinking.. except its a stock acura cd player.. i figure out somthing.. thanks for all the help though!!