Carrico's Build (98 blazer 4dr)
What is a good wire to tap into for an ign source for an efan?
I have two relays setup, one high and one low speed for my intrepid fans. Both relays 40amp 5 pin [30,85,86,87,(87a-not used)] and a 2 prong toggle switch (batt/accessory). here is my layout that i have.
Pin:
30-battery
85-ground
86-fan(low speed)
87-accessory on toggle switch
and the second relay is the same except 86 is high speed and 87 is the green ac clutch wire.
So my question is for my 2nd prong on the toggle switch which is battery(or ignition source) what is a good place to splice that into?
I have two relays setup, one high and one low speed for my intrepid fans. Both relays 40amp 5 pin [30,85,86,87,(87a-not used)] and a 2 prong toggle switch (batt/accessory). here is my layout that i have.
Pin:
30-battery
85-ground
86-fan(low speed)
87-accessory on toggle switch
and the second relay is the same except 86 is high speed and 87 is the green ac clutch wire.
So my question is for my 2nd prong on the toggle switch which is battery(or ignition source) what is a good place to splice that into?
What is a good wire to tap into for an ign source for an efan?
I have two relays setup, one high and one low speed for my intrepid fans. Both relays 40amp 5 pin [30,85,86,87,(87a-not used)] and a 2 prong toggle switch (batt/accessory). here is my layout that i have.
Pin:
30-battery
85-ground
86-fan(low speed)
87-accessory on toggle switch
and the second relay is the same except 86 is high speed and 87 is the green ac clutch wire.
So my question is for my 2nd prong on the toggle switch which is battery(or ignition source) what is a good place to splice that into?
I have two relays setup, one high and one low speed for my intrepid fans. Both relays 40amp 5 pin [30,85,86,87,(87a-not used)] and a 2 prong toggle switch (batt/accessory). here is my layout that i have.
Pin:
30-battery
85-ground
86-fan(low speed)
87-accessory on toggle switch
and the second relay is the same except 86 is high speed and 87 is the green ac clutch wire.
So my question is for my 2nd prong on the toggle switch which is battery(or ignition source) what is a good place to splice that into?

I am not 100% sure on this. But I know the one on the front is 12v constant.
Sorry it took me so long!
For my setup I used two 4 pin relays and a single toggle in the cab.
For the low speed side
Pin 86 ran to this tstat switch in the pass side head http://shop.advanceautoparts.com/p/bwd-engine-coolant-temperature-switch-tfs4/5970644-P
Pin 30 is power from the battery
Pin 85 ran to toggle switch inside the cab for ability to turn the fans off (the toggle gets its power from a fuse in the fuse box I just picked a switch circuit and went with it)
Pin 87 is the power to the fan (green wire on fan)
With this setup the fans turn on low speed at about 211-212 deg.
For the high speed side
Pin 86 ran to chassis ground
Pin 30 is power from the battery
Pin 85 is ran to the ac compressor hot wire
Pin 87 is the power to the fan (yellow wire on fan)
With this the high speed will turn on any time the AC compressor turns on. If the tstat for the low speed is open only one fan will come on high but if its closed and the low speed is on both will kick onto high speed. I have sat in traffic for an hour in 100deg heat with the ac on blast and the low speed rarely came on as one fan on high was enough to keep the engine cool.
When I originally installed the fans I started with an electronic controller and it was a waste of money IMO. The mechanical tstat is much more reliable and much cheaper. I found the tstat and pig tail on ebay for for $15 shipped.
Here's a couple pics of my setup that were taken today. I still need to move the #4 relay into place and zip tie some wires after installing the new tstat but I'll do that another day. The other two relays are for my lights.



For my setup I used two 4 pin relays and a single toggle in the cab.
For the low speed side
Pin 86 ran to this tstat switch in the pass side head http://shop.advanceautoparts.com/p/bwd-engine-coolant-temperature-switch-tfs4/5970644-P
Pin 30 is power from the battery
Pin 85 ran to toggle switch inside the cab for ability to turn the fans off (the toggle gets its power from a fuse in the fuse box I just picked a switch circuit and went with it)
Pin 87 is the power to the fan (green wire on fan)
With this setup the fans turn on low speed at about 211-212 deg.
For the high speed side
Pin 86 ran to chassis ground
Pin 30 is power from the battery
Pin 85 is ran to the ac compressor hot wire
Pin 87 is the power to the fan (yellow wire on fan)
With this the high speed will turn on any time the AC compressor turns on. If the tstat for the low speed is open only one fan will come on high but if its closed and the low speed is on both will kick onto high speed. I have sat in traffic for an hour in 100deg heat with the ac on blast and the low speed rarely came on as one fan on high was enough to keep the engine cool.
When I originally installed the fans I started with an electronic controller and it was a waste of money IMO. The mechanical tstat is much more reliable and much cheaper. I found the tstat and pig tail on ebay for for $15 shipped.
Here's a couple pics of my setup that were taken today. I still need to move the #4 relay into place and zip tie some wires after installing the new tstat but I'll do that another day. The other two relays are for my lights.










