Fan Wiring

[redeclipse7782]

I have searched several forums and found several different posts on how to wire in a new aftermarket main fan for a 2g all seem to have different responses which is confusing as hell. I wish certain questions were answered once correctly then moved to tech and all posts were deleted. Can someone please tell me what wires are what? Also if I only connect the high speed + and high speed - the fan will always be running in high speed mode correct?

high speed +
High speed -
low speed +
low speed -

Thank You,
-Brian

 

[redeclipse7782]

Radiator
------------
White-Black + (Lo)
Black - (Lo)
White-Blue + (Hi)
Blue-Green - (Hi)

Condensor
------------
Blue + (Lo)
Blue-Black - (Lo)
Blue-White + (Hi)
Black - (Hi)

Source: 1998 Mitsubishi Factory Service Manual Vol3

 

[halik008]

Brian,

The stock fans are two speed, but slimelines are only one speed. The way i understand it the ecu triggers the "low" setting when it reaches the first threshold temperature and then relay activate the second "high" + when it reaches the second treshhold temp. Honestly i have not check manually to make sure, but i highly doubt the "low" + gets cut off when the "high" is on.

so this is how i wired mine:

ground is ground so i wire both ground wires to the ground of the fan. Then i wired the positive of the fan to the low setting. That way it turns on when the low in triggered and keeps going while the "high" is triggered.

The "high" + is not conected.

 

[Staytuned]

I did it the other way, I wired both high and low together on both sides. I still have no problems to this day with relays or fan motors.

 

[redeclipse7782]

I wired the high and low + together and the high and low - together. It really helped when I found out the radiator fan is on the passenger side. I'm used to my old GS where the fans are backwards.

 

[halik008]

I did it the other way, I wired both high and low together on both sides. I still have no problems to this day with relays or fan motors.

yeah there is nothing really wrong with wiring the two +'s together......all you really did by wiring those two together is double the current carrying capacity

I just didn't want to deal with possible back flow when the "high" + is open.

 

[Turbocharged]

If you no longer have fog lights, run a couple inches of wire under the fuse box to connect the fog light relay to the fan relays (hi or low, its your choice). When you press the fog light switch, your fans will come on.

I also wire both +'s and -'s together.

 

[redeclipse7782]

That is a very good idea.

 

[halik008]

That is a very good idea.

don't forget fog light switch and it's relay only becomes energized with the low beams on in it's stock configuration. Sooo in order to do this you also need to run a keyed 12v to the foglight relay so it's energized everytime you turn the car on. You don't want to run it off of constant 12v since your are running the risk or draining your battery in the event you forget your fans are on.

 

[Turbocharged]

don't forget fog light switch and it's relay only becomes energized with the low beams on in it's stock configuration. Sooo in order to do this you also need to run a keyed 12v to the foglight relay so it's energized everytime you turn the car on. You don't want to run it off of constant 12v since your are running the risk or draining your battery in the event you forget your fans are on.

I didnt wire it to the fog light power. Im basically only using the fog light relay as a switch. When the fog button is pressed, it sends a signal to the fan relay as well as the fog relay (effectively opening both relays regardless of whether the headlights are on).

My fans turn on with or without the headlights. Give it a try.

I previously had the fans wire to a switch and relay off the ignition power. It was nice because I could leave the fans on while the turbo timer was counting down, but they would shut off with the car.

There are endless number of ways to do it. I personally like using the fog light switch.

 

[halik008]

I didnt wire it to the fog light power. Im basically only using the fog light relay as a switch. When the fog button is pressed, it sends a signal to the fan relay as well as the fog relay (effectively opening both relays regardless of whether the headlights are on).

My fans turn on with or without the headlights. Give it a try.

I previously had the fans wire to a switch and relay off the ignition power. It was nice because I could leave the fans on while the turbo timer was counting down, but they would shut off with the car.

There are endless number of ways to do it. I personally like using the fog light switch.

somebody did the foglight mod for you already then. He will still need to do the mod to his fog lights for it to work for him. In stock configuration the fog light circuit is disabled until low beams are on.....

 

[Turbocharged]

somebody did the foglight mod for you already then. He will still need to do the mod to his fog lights for it to work for him. In stock configuration the fog light circuit is disabled until low beams are on.....

No, Im the original owner of this car and nobody touches it but me. When the fog relay is opened (fog button pressed) it switches the fog AND fan relays open. There does not need to be a voltage applied to the fog lights, you can even remove all the fog light power/ground wiring if you want (I did).

I wired the 87 terminals from the fan relays to the 30 terminal from the fog relay. You press the fog switch, the relay for the fogs opens thereby opening the relays for the fans (terminals 87 and 30 are ONLY used to SWITCH power on/off; they have nothing to do with power leads to either component). The fans dont care if the fogs are seeing voltage or not, the two are sharing a switch that opens separate power sources. The fogs only turn on if the relay is open AND there is voltage in the power lead (voltage is only applied to the fogs when the headlights are turned on but the relay can still be open with or without this voltage; that is the concept this idea is based on).

I prefered this setup because I was trying to reduce wiring in my car and utilize whatever wiring was in place.

Basically, the fogs and fans are sharing a switching source but have separate power sources. I think you are confused because the fogs require TWO switches to turn on. The button switch (switchs relay of interest) and the head light switch (switchs headlight relay which is a separate relay). I ran my fans off of the button switch/relay.

Maybe Im not explaining this clearly. To make it more obvious, go and try it yourself as it only takes a minute or two.

 

[halik008]

No, Im the original owner of this car and nobody touches it but me. When the fog relay is opened (fog button pressed) it switches the fog AND fan relays open. There does not need to be a voltage applied to the fog lights, you can even remove all the fog light power/ground wiring if you want (I did).

I wired the 87 terminals from the fan relays to the 30 terminal from the fog relay. You press the fog switch, the relay for the fogs opens thereby opening the relays for the fans (terminals 87 and 30 are ONLY used to SWITCH power on/off; they have nothing to do with power leads to either component). The fans dont care if the fogs are seeing voltage or not, the two are sharing a switch that opens separate power sources. The fogs only turn on if the relay is open AND there is voltage in the power lead (voltage is only applied to the fogs when the headlights are turned on but the relay can still be open with or without this voltage; that is the concept this idea is based on).

I prefered this setup because I was trying to reduce wiring in my car and utilize whatever wiring was in place.

Basically, the fogs and fans are sharing a switching source but have separate power sources. I think you are confused because the fogs require TWO switches to turn on. The button switch (switchs relay of interest) and the head light switch (switchs headlight relay which is a separate relay). I ran my fans off of the button switch/relay.

Maybe Im not explaining this clearly. To make it more obvious, go and try it yourself as it only takes a minute or two.

damn it i had a lond reply wirtten and then t00ners decided to go down

ok here is the short and sweet version:

What you said doesn't sounds right.

Fog relay:
-fog switch controls the 85&86 poles of the relay....the energizing part
-87 & 30 are the controlled hi current power lines

If you did wired the 87 terminals from the fan relays to the 30 terminal from the fog relay you still wouldn't get no power to the fans since the 87 pole of the fog relay do NOT get any power until the low beam relay closes. The headlight relay provides power to the 87 or 30 (depending on how it's wired.. dun really make a diff) of the fog relay.

What you most likely did is is wire it to the 85 or 86 pole of the fog light relay which is a dangerous condition since those are not designed to handle the current the fans draw.

 

[Turbocharged]

damn it i had a lond reply wirtten and then t00ners decided to go down

ok here is the short and sweet version:

What you said doesn't sounds right.

Fog relay:
-fog switch controls the 85&86 poles of the relay....the energizing part
-87 & 30 are the controlled hi current power lines

If you did wired the 87 terminals from the fan relays to the 30 terminal from the fog relay you still wouldn't get no power to the fans since the 87 pole of the fog relay do NOT get any power until the low beam relay closes. The headlight relay provides power to the 87 or 30 (depending on how it's wired.. dun really make a diff) of the fog relay.

What you most likely did is is wire it to the 85 or 86 pole of the fog light relay which is a dangerous condition since those are not designed to handle the current the fans draw.

I got the 30/87 and 85/86 terminals confused. I shorted the control circuits and left the load circuits alone. There is no voltage transfer from the two components. I AM USING AN OTHERWISE UNUSED RELAY TO SWITCH ON THE FANS; that is what a relay does, it is an electromagnetic switch. I am only utilizing the switch, not the load terminals. The fans run off the circuitry they were designed to run off of, not the fog circuitry. Im just using the fog relay to switch on the fan relay. Its very simple and requires maybe 6 inches of wire.

Maybe this will help you:
http://electronics.howstuffworks.com/relay1.htm

Im done explaining this, good luck.

 

[halik008]

I got the 30/87 and 85/86 terminals confused.

ah ok now it actually makes sense you are running the fog relays 85&86 parallel with the fan relays 85&86.

In that case you could just skipped the fog light relay all together and connects the 12v going from the fog switch directly to the fan realys 12v (86 or 85 depending) at the fuse box....

hehe i don't need no explanation of relays i work for Takata's electronic R&D

 

[Turbocharged]

ah ok now it actually makes sense you are running the fog relays 85&86 parallel with the fan relays 85&86.

In that case you could just skipped the fog light relay all together and connects the 12v going from the fog switch directly to the fan realys 12v (86 or 85 depending) at the fuse box....

hehe i don't need no explanation of relays i work for Takata's electronic R&D

Exactly! Im horrible at explaining these things. I would prefer to draw a picture but Im also lazy.

 

[flacopower]

how can you tell which pole is which? on all the relays i have ever worked on there has been numbers on them.. on the fan and fog relays there are only wires coming out of the bottom..

 

[siceclipse]

subscribed for future refrance.

 

[chicagoavenger]

What about the 1g?

 

[flacopower]

found which was which.. just went to the vfaq..