hooking up something to headlight switch...

[hatchbacksi]

how do i hook up something to come on when the headlights come on? such as indiglos or a neon light or something.....

[hatchbacksi]

i was just thinking i could tap it into my headlight fuse or something like that......but i dont know if it would overload the fuse...

[AudioGuy93DelSol]

Just find the power wire for one of the headlights and tap into it, then ground it to the chassis. Its safe to run small things like neons and such and it wont cause your headlight to dim either.

[Geeko]

The best thing to do is run a relay off of the lightswitch output- no current drain at all (well, it's negligable, anyway) and you can run virtually any part off of it, since you are tapping operating power from somewhere else.

[hatchbacksi]

Originally Posted by Geeko

The best thing to do is run a relay off of the lightswitch output- no current drain at all (well, it's negligable, anyway) and you can run virtually any part off of it, since you are tapping operating power from somewhere else.

how do you do that???

[AudioGuy93DelSol]

Ah, a relay, didnt even think of that. Very basically, a relay hooks up to a power wire, when it "senses" the voltage is on, it flips a internal switch that is connected to whatever, but that switch has its own power source, thus is doesn't take power from that original power wire. So, in your case, you hook a realy up to that wire for the headlights, then hook the neons, or blender, or elecric lawmower or what ever up to the relay, so then whatever you hooked up comes on when the lights are switched on with out taking power from the light circuit. Hope that helps. (Dont really try and hook a blender or lawnmower to you car)

[Ricochet]

Wrap the + wire around either prong on the instrument panel lights fuse, and wrap the - wire around a bolt screwed into the metal somewhere under the dash. This will be perfectly fine for indiglos or a neon, and is easily reversable unlike cutting into wires.