I have some bi-polar(i think that is the term) LEDs. They are red when you switch the polarity and green when you switch the polarity again.

I want the LED to be red with the FAN off, and Green when the fan is on.

I am just not sure how I can get this to work.

Any ideas?

 

i just have my efan wired up to a single polority LED.....the LED comes on when the fan is on and off when it is off.....isn't a dual polarity LED kinda like a SPDT switch or relay?

 

I imagine you would have to use a relay for that, I'm just not sure how you'd wire it.

 

Not sure what kind of relay you would be using (SPDT should be fine). Of course terminal numbers may vary... just look up your type of relay and it should make sense. If not, I can elaborate more.

 

that would work, but the LED is only a 2 wire LED. if all else fails Ill just get the 3 wire LED.

do you know if I can use a 2 wire LED?

didnt think about doing it that way.

 

Nothing that I can think of. Reversing voltage is a bit more difficult to do and do properly (not having it back-feed to the e-fan power supply). I would go with a 3-wire LED.

 

yeah that is what i was trying to figure out how to do.

your way is much easier. thanks

 

No prob. I've never worked with an e-fan, but where do you plan on tapping the power for it? My personal recommendation would be the actual wires going into the fan, so you can catch potential controller issues.

 

my plan is to tap the wires going into the fan. probably mount the relay under the hood and run a small set of wires into the cab.


i will probably fuse it again too. i mean 1 amp should be enough to trip the relay right?

 

Ya know, I've never checked the current rating on a relay. I would *think* 1A would be fine. Sounds like a plan though. Let us know how it turns out!

Where do you plan on mounting the LED?

 

I am actually thinking about tearing the whole dash apart and mounting it in the cluster by the water temp gauge. we will see how my ambition is. lol

 

i mounted mine in the dual gauge pod next to the AutoMeter water temp gauge...

 

Well, shouldn't be *too* terribly difficult. Drilling a hole through it and mounting it with one of those black holders should do the trick. Now if you wanted to get *really* fancy you could put in a fan indicator... I'm thinking like a 1/4" square light with a black mask and a fan pattern in it. I have no idea where to even start looking for such a thing though.

 

lol WAY too much work

 

Yeah, it was more of a "what if they have a prefabbed indicator" type what-if. Good luck with it!

 

well i thought i had those LEDs but could not find them tonight. maybe ill pick one up this weekend.

 

Shouldn't be too hard to find, but if you need one I have the rectangular ones with 3 leads. Though that would probably be harder to mount...

 

yeah i want to stick to the round ones. I have them everywhere else in the truck

thanks though!