Official Electric Fan wiring thread!

[Roysneon]

My problem still persists as well. There is no fan wiring for the thermoswitch, no connector at one side of the aux. fan fuse and no connectors for the spades for relays k1 or k9.

I guess I'll have to do some more investigation including opening up the fusebox and perhaps just adding in some wiring to get power to the fuse and some inputs and outputs to the relay.

[dmoney(AB)]

up?

[dmoney(AB)]

alright heres what I'm working with.

Have no idea what the PO did with the wiring up front but I see its quite hacked and I don't see the aux RED and BLACK hookup.
I found that in my bentley it says to jumper the white together for the term switch but it seems I have the black/green and black and brown wires as in a 325i harness (my car is an 86 325e)
quite a few disconnected connectors:
Drives side:

Passenger side bottom:

Passenger side top:


I don't have a/c. I have a spal fan I want to wire up with a termo switch and to the a/c button.

so confused :(

[Roysneon]

My car didn't have an aux. fan and I'm also pretty sure it didn't even have the wiring for it. I'm going to see what I can do to get power to the fan and thermoswitch sometime. Right now I have the fan running constantly which I guess is ok for the summertime but in a few months the engine may be running constantly cold.

[328ijunkie]

Should be the same as anything else as its part of the body harness not the engine harness.

[dmoney(AB)]

reviving this thread.

I'm looking to wire my spal to my a/c fan hook up so it will run automatically when the coolant reaches 82* and also use my a/c switch as an override.
I will snap a few pics of what plugs I have in my car as it is swapped now with a 2jz

body harness is an 86e

[BoostinEuros]

I'm having a bit of a problem..


My fan is wired up exactly how it is shown below.




If I touch the two terminal together, the fan turns on. However, the fan will never turn on when the car is running...Even up to the 3/4 mark.

The fan switch is an 82 degree unit, and I have an 80 degree thermostat.

[328ijunkie]

factory fan plug if youre putting an aftermarket fan in there.

[tfritz]

Slightly confused on what all I am tapping into, and running to the fan. My setup is on an m30 swapped car using a 318ti 3 prong switch, but the wiring should be pretty much the same. Am I tapping into the thermo switch wiring? If so, where are those wires going to/from? Or am I just hooking up to the factory fan plug as stated by the first part of the original post?

Thanks!

[328ijunkie]

Yup. Seen it happen a few times. Change out the high or low speed relays and it won't do that anymore

[Frenche]

Junkie youre saying that my relay is broken thats why it was happening?

[328ijunkie]

Relays. Broken

[Frenche]

My experience

I have finally completed this!

I went a somewhat different route than the instructions.
At first I had wired my FAN ground to the brown wire. My fan POWER to the black wire. Then for my 2 prong 82C thermo switch I connected blackbrown wire to the black green wire and attached that to one prong. Then I connected the black wire to the 2nd prong.
When i did this the fan would turn on whenever I had turned the key on. My dads friend who is an electrician came home and helped us out. We did a lot of testing of all the wires and finally realized that the method in the pictures Im posting works.


This is the green/black wire attached to one male prong and the black/brown wire attached to the other male prong. I realized that when u have the BK/Gree and BK/BRO together it gives the fan juice no matter what so I decided to plug them in that way so when the switch closes it gives me power.



Here the brown and red wires are staggered and taped together so that they do not cause any problems.
The yellow is my ground from the fan and is attached to my hood.
The black and red are the power the fan receives.

[36brua]

That is stated in the OP but

after the 3 pin connector for the fan. The brown wire is ground. The Black wire is low speed (if you want AC you need to hook this up) and the Red wire is High speed (what the temp switch will kick on).

So Brown (from the car) goes to the ground wire on the fan while red and black wire(from the car) go to the power wire on the fan. Only one wire sends energy at a time. Never both.

Thanks for info I can start with ! :)

[bzboardz]

either you have the wrong thermoswitch or you have it wired backwards.

I currently have it wired to the high speed (black/brown) I will try wiring it on the low speed (black) and see what that does. If not then I will look into the 2 pole switch in OP