fake alarm led's

[bilby]

NEED HELP !!!!!!!

what wires should i put a fake alarm led light into in a 90 lwb GQ so that
it flashes when the ignition is off but shuts off when the car is running
it has 2 wires red and yellow which is which ?

anyone help ?

[mickyd555]

maybe your suposed to run it through a N/C contact on a relay that is operated by the accesories switch

[bilby]

maybe your suposed to run it through a N/C contact on a relay that is operated by the accesories switch

ok worked out red is + yellow is ground

what wires would have power ( ie memory wires ) to tap into so when the ignition is turned on the led stops flashing ?

[murcod]

You could just wire the LED earth through something like the handbrake switch- that way it will only work when the handbrake is on. Then wire the positive to a permanent 12v source (and fuse it just in case.)

[-Scott-]

Or you could put it somewhere you don't see it while driving, and not worry about turning it off?

[bilby]

Or you could put it somewhere you don't see it while driving, and not worry about turning it off?

thought of that but at nite it would still be visible i reckon

[Rainbow Warrior]

The best way to wire the LED up is red wire to permanent +12v then you wire the black or negative to an accessories or ignition circuit. I've done this on 2 cars no problems after 7 years.

What then happens is when the accessories/ignition is on there is 12v on each side of the LED so it doesn't light up. But when you turn off the accessory circuit there is +12v difference, so what happens is the electricity will look for a way to get to the negative of the battery, usually in the positive wire of the car stereo or the dashboard instruments and out the negative wire. The power/current flowing through the LED & stereo is only a trickle so it's not going to power on the stereo. The only time I've seen this not work is when a mate had an old on/off volume knob stereo which left no path if he turned the stereo off, stereo was left turned on at the knob it worked fine.

[bilby]

The best way to wire the LED up is red wire to permanent +12v then you wire the black or negative to an accessories or ignition circuit. I've done this on 2 cars no problems after 7 years.

What then happens is when the accessories/ignition is on there is 12v on each side of the LED so it doesn't light up. But when you turn off the accessory circuit there is +12v difference, so what happens is the electricity will look for a way to get to the negative of the battery, usually in the positive wire of the car stereo or the dashboard instruments and out the negative wire. The power/current flowing through the LED & stereo is only a trickle so it's not going to power on the stereo. The only time I've seen this not work is when a mate had an old on/off volume knob stereo which left no path if he turned the stereo off, stereo was left turned on at the knob it worked fine.

WOOT cheers rainbow warrior worked a treat
cheap theft deterent

[Rainbow Warrior]

WOOT cheers rainbow warrior worked a treat
cheap theft deterent

Another variation of this is wiring a small buzzer between the headlight switch output and accessoeries to remind you to turn your lights off.