Wiring Additional Aftermarket Fan
 

Hey guys,

First post here, the car is a 94 eunos roadster.

​​​​​​Originally came with AC that I stripped out a little over a year ago to make space for the intercooler. I got the stock AC fan to fit with a bit of cutting but the clearances didn't inspire confidence so I've opted to replace the fans with 2 of these SPAL 11"

Each fan pulls about 9.3A so I can wire one up to the stock Colling fan relay and let the ECU turn it on/off as standard, but is there anyway wire a 2nd relay to the output signal for the cooling fan using the stock AC wiring or am I better off wiring from scratch?

I'd also considering putting the 2nd fan on a switch as I have no issues with cooling unless I'm doing 10+ minutes of continuous drifting and red lining the car quite a bit.

​if anyone knows of any guides for this I'd appreciate it!

Thanks

If it were megasquirt I think you could just reroute the condenser fan relay to a output, then just toggle it off a programmable output. On my car 2C is the condenser fan relay, grounding it will run the AC fan.

Wouldn't be a simple case of finding the pin that is the trigger from the ECU to the main cooling fan relay and splicing I to that for the AC fan's trigger?

Sorry, electrics are something I'm not too great with, but I should be able to get a pin out for my ECU.

Cheap shadetree option:
Tap into the output of the main fan relay as a trigger for an aux fan relay. Supply power (to be switched) to the aux fan relay via a (15A) in line fuse taken off the downstream side of the main 80A fuse in the engine compartment fusebox.

Yes, assuming the stock wiring is enough for the fans, and you do actually want both on everytime. I did the same on my 11" Spal low profiles, worked fine. I forget the draw though.

Space is tight there, so just jump it with enough position/slack you don't stress the OEM wiring.

Deezum's is the safer advice if you didn't know the wiring capacity or draw requirements.

Link to pinout for 94-95