Does anyone know what wire has 12v when the engine is running? Or how I can get a wire that has 12v when engine is running? Thanks

 

http://www.amazon.com/s/?ie=UTF8&key...l_5gf1io567t_e

 

There are probably 100 wires that are hot when the engine is running. What area of the car are you working in? What are you trying to power? What kind of amperage do you need to power whatever your trying to put in?

 

Area= passenger side front near head light
Amperage= doesn't matter about the amperage because I'm gonna just use it as a signal wire for a relay

 

If I remember correctly any pink wire with a black stripe is power ignition on.

 

I don't want it to be on when the ignition is on I need it to have 12v when the engine is running only

 

The key is in the on position when the vehicle is running.....

 

Good luck with that, sounds like you should install a reverse rotation c/k truck mechanical fan.

 

I mean only when the engine is running I want 12v

 

http://m.summitracing.com/parts/hly-12-810

Can this work for turning on the fans when the engine is running? It will normally be open and when the engine is running pass 5psi it will close the circuit and send power to the fan relay? Do I have this correct? Can this pressure switch do that?
Thanks in advance

 

If your dead set on ahortening the life of your fans and hacking up your wiring you could install a acdelco D1818 gm 25036553 oil pressure (4 PSI) (runs fuel pumprelay fails)
Switch, oil pressure (4 PSI) to control a relay.

 

Why are you wanting to bypass the fan switch?

 

 

Thank you so much for the fast replies.
If I use that switch the fan won't run when the engine is started. The switch opens when the pressure rises above 4psi? Or does it close? If it closes that would be perfect! But if it doesn't the fans will never turn on when the engine is running

 

I bought the car with the dual fans running off of the coolant temp sensor on the passenger side head and when the engine is warm and I turn the ignition on the fans run all the time. So me and Tuned Performance are trying to figure out how to get the fans to run only when the engine is running

 

It's a normaly open switch.

 

Why not just wire in a toggle switch then. You can turn them on and off at your discretion. When the car is running down the road at speed, you don't need them on anyway. Or a new switch, http://www.autopartswarehouse.com/sk...0-80e2d0037ec1

 

I have that currently but if don't
Like the fact of the toggle switch lol

 

Thanks I'll give it a try

 

How about a new switch i posted in #17 above

 

I don't think that would fix the problem either. I just don't want the fans to run when the ignition is on. I only want them to run when the motor is running and the car is warmed up

 

How often do you sit with the ignition ON and the engine off? Sounds like a good way to prematurely burn a coil out.

If you're really set on doing this why not ponder this, install the oil pressure switch, but wire it in line with the existing coolant temp switch in the head, then the fans will only run when the engine is running AND hot.

That way your not putting a bunch of extra stress on the fan motors running all the time when they don't need to be. Add a few more years to their lifespan.