kiweenis

Hi fellow rotary enthusiasts.
Any suggestions as to what I should tap into for the ignition cable for an electric fan?
I've poured over the wiring schematics in my Haynes workshop manual but this car is so butchered that nothing seems to be where it should. Any suggestions as to what is going to allow for thermostatic switch (165 on, 145 off) with ignition on control.
So hard to see the colors on these wires too.
Any help is definitely appreciated.

mazdaverx713b

iTrader: (91)

What year is your 7? This will help when looking for a solution as the wiring varies over the years.

kiweenis

Oh, duh. Forgot that part. Thanks.
1984 RX7 GSL-SE. It's been really butchered though. No emissions hoses, loads of random connectors without connections...
I was going to tap onto the back of the alternator but thought that wouldn't be wise.

yeti

iTrader: (1)

I may be an outlier but I just let the fan run when the car is off. The fan should only run when a defined conditions are met (sensor detects the water is above trigger temp). Isn't this is also how some (most?) modern cars operate?

If you need/want an ignition source wouldn't the ignition wire going to the coils work? Or maybe one of the fuses? Since it's just ignition signal you are looking for load will be very low.

kiweenis

Yeah, I don't really want the fan running when the car is off. I mean. I'd like the ignition line to control what is going on in my engine bay. So you think coming off the first line that goes to the coils would work?

Spetz

I have mine tapped to one of the positive terminals on the ignition coils. Those are key on only.

kiweenis

Cheers Mate!! I'll use that then! Bloody easy to find too!!

Spetz

No problem! They are convenient because they are already set up for a ring connector.

This is just to trigger the relay on correct that controls the fan?

kiweenis

Correct. Super easy to connect to. Will take the power source from the battery but wanted to use the relay off of the ignition. Much appreciated!!

raven12aFB

I just installed my new dual electric fans with a dual fan controller and got it connected to a positive terminal on one of the coils....it only works when the ignition is on....

Benjamin4456

Dang, y'all took a much better approach than I did. I ended up running the wire all the way inside the cabin and tapping into the defroster power wire. Guess it was habit since I've already tapped into it for a number other things, but I wish I had thought of just using the ignition coil. Hindsight is 20-20 they say...