electric fan, wiring check, on/off/on, therm

Hello I am new to the forum and all the information was found while researching on how to make my electric fans run. My car is a sc300 with a 2jzgte (if it matters) and the fans are from a 2003 is300. I come here to ask if anyone has suggestions or changes that need to be make to the diagram. My main concern is on the switch itself (in green) the switch came with the diagram noted. ThanksSc300 - 2jzgte

If I'm reading your diagram correctly when that thermal switch closes, it is just going to short your switch out. I'll try to get a correct diagram together tonight. Do you know what amperage each fan pulls?Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Here is a very crude diagram... but it should give you the idea. Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Hey thank you so much. To make the digram you gave me gives me either three options. On for always on, Off in the center, And auto the ones that goes to the thermal fan switch? Also does it matter if 86 is ground vs. 85 being a ground?Sc300 - 2jzgte

Yes, the switch should have an input, then a contact for on and for auto. With the above diagram if the switch is on, the fans will be one. If the switch is set to auto it will use the thermal switch to turn them on. I have never had any issues with which pin (85/86) goes to positive vs ground. I've connected it both ways without an issue.Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Thank you so much good sir. 100 internetsSc300 - 2jzgte

If you want the fans to automatically shut off with the car then take the input for the switch off an ignition source instead of a 12v constant source.Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Kenny, ignition to a relay, at least 80 amps switching required, the onrush if both cut in at once can be 80 amps +.

Maybe I was unclear. I meant to ONLY run the ignition input to the switch... which in turn runs the relays. DO NOT run the ignition to the input of the relays because it will blow your ignition fuse (more than likely). I was not aware those fans pulled that much amperage. Check the rated draw and if Howie is correct (and he usually is... lol) make sure to get adequate relays to handle the draw.Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Ok I will check that as well. Are you sure that the thermostatic switch is correct? Iv been doing alot more searching and it seems that the switch has two terminals one that goes to a 12v source and one that connects to ground. ?Sc300 - 2jzgte