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: what ways can I hook a switch up to my fans? castilano200sx 05-08-2009, 02:53 PM I have a 98 200sx and I think something is up with my ecu again because the fans dont kick on when it starts to over heat. If I pull the plug from the sensor the fans will come on. I saw one thread about how to do it by tappin into the ecu wires. Can I just run power to a switch, then from the switch run the power to the fans positive wire and just tap into there? SentraDude 05-08-2009, 03:16 PM I was thinking of using my A/C button... I removed my A/C so nothing is hooked up to the compressor wire and when I turn on the A/C nothing happends, however typically when you turn on the A/C both fans come on... So, now i just need to figure out how to fool the switch thinking A/C compressor is there.. im not sure If i just need a jumper at the end of the cable or what.... castilano200sx 05-08-2009, 05:51 PM I was thinking of using my A/C button... I removed my A/C so nothing is hooked up to the compressor wire and when I turn on the A/C nothing happends, however typically when you turn on the A/C both fans come on... So, now i just need to figure out how to fool the switch thinking A/C compressor is there.. im not sure If i just need a jumper at the end of the cable or what.... that would actually be a good idea because I dont have A/C either......but the fans have a decent size gauge wire so I dont *** if it would be good to hook it up to that switch...ill have to look at the switch n see. I was going to just take fans plugs from another harness and have the postive going to the battery then run the ground inside the car to a switch. chriscar 05-08-2009, 06:35 PM All you need to do is ground the fan signal line at the ecu. I believe it's pin 9 or 10 on a B13. Doing it this way allows you to use the AC switch, since it's a low current line. C chriscar 05-08-2009, 06:42 PM http://www.sr20forum.com/2392857-post15.html hammerthumb81 05-09-2009, 09:44 PM get a coolant temperature switch if you unplug it and the fan comes on. That means everything is working except the sensor is not activating your fan. ShortyzKustomz 05-10-2009, 01:03 AM Not the best way, but it was like this when I got it and I plan on cleaning it up, Ran off the battery to a toggle with a relay to the fans hammerthumb81 05-10-2009, 01:24 PM Oh by the way if u don't plan to fix it right and decide to do a toggle switch. Always put the switch on the ground side. | ||