How do I run a wire from the ignition switch so that it will current will flow through it when the ignition switch is on (duh, like everything else). I have a 2-speed electric fan from a 2nd gen 3.8l Taurus for my TII, and I'm trying to figure out how to wire it up. I want to have a 2-way switch to toggle between the high and low speeds, but it needs to be on whenever the ignition switch is on, regardless. Where exactly do I make my connections to run power from the ignition switch?



Lol, sorry. Dumb question, and worded horribly to boot. https://www.nopistons.com/forums/pub...DIR#>/wink.png

i think i followed what u said. you want to mount a toggle switch inside car to operate your fan. just get a 12v source thats only on when the cars on. use a test light poke around. best way to do it is to buy one of those nine dollar relays they have on the shelf at parts store. then you can put the fan on its own circiut. relay should have 4 male spade connectors. one is 12v in. one is 12v out. the other two are for your switch(to turn power on/off). then you ground the fan. dont forget to put an inline fuse between battery and relay. hope this helps. dont know how the wiring is on ford fan.

the fuse box under the hood has power and an empty slot. you can put a fuse in there and wire that to the fan (or whatever). its not switched though



mike

Hmmm... I had a feeling I wasn't gonna be able to get my point across with that question, lol. I did, however, manage to get an answer to my question, but that was only after I figured out what the question was. https://www.nopistons.com/forums/pub...DIR#>/wink.png



I was just wondering if it was okay to splice a wire off an existing circuit to provide power to my fan circuit when the ignition is in the 'on' position. Like, for my fan circuit, I'm gonna splice a wire off of the wire that powers the tach from the trailing coil, run that to an ON-OFF-ON toggle switch, then run two wires from the switch to the coil-side of two seperate relays, then to ground. Then, I'll run two wires from the positive battery post to the switch side of the relays, then connect them to the two power wires of the fan, then ground the fan. Hopefully this will provide power to the fan whenever the ignition is in the ON position (except if the toggle switch is OFF), and the two different ON positions on the switch will let me toggle between the high and low speeds of the fan....



That makes sense, right?

you have to make sure that the circuit you use can handle the current



mike

i second that j9fc3s. there are losts of 12v sources. personaly, i'd stay away from messing with that ignition. find another wire. using the the main (with the fusible links) under the hood is the best way.

I'd wire an inline fuse if your car is mostly stock otherwise (meaning the stock electrical system is probably already used to spec with the stock electrical components).



What I mean is, you have a high current wire to provide power through the relay that the fan will run off of, put an inline fuse on that wire and just run it to the battery +. Now just wire your relay and switches to whatever ignition controlled power source you want in the car. The relay itself is not a large draw so you don't have to worry too much about what part of the stock wiring you hook the controls + into.



If you have done something drastic, like, say, removed the HVAC, then it would be possible to wire the fans power into the big-assed HVAC fuse without trouble.



hope that makes sense.

Oh yeah, I have inline fuses placed between the battery + and the relays going to the fan, just forgot to mention it, lol.



Thanks for the help. https://www.nopistons.com/forums/pub...IR#>/smile.png

i forgot to mention it but the aas connectors have 12v switched power and its a 15a fuse



mike