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

something like this here ..http://www.ramchargercentral.com/electrical/electric-fan-wiring/Sc300 - 2jzgte

That diagram there is just using the thermal switch on the ground instead of the power. I wouldn't recommend connecting it like that because you will be getting the full draw of the fans through that switch. If it is not meant to handle that much current it will burn out. Wiring it like I posted will draw very minimal power from both the manual switch and the thermal switch.Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

X 2 with what offroadzj said. If it has two wires and becomes a closed circuit, i.e. a switch, pos to neg or vice versa = BANG. You can switch pos to pos or neg to neg. All modern vehicles use low current often negative switching, think of a defroster.

Thank you guys for your input. I dont really need the fans to turn off with the car because I will be running a turbo timer and according to a lot of people the temp usually comes down when the car is standing still with both fans on. hat gauge wire and what kind of relays would be sufficient enough for the fans. I tried to look for draw but couldnt find it anywhere. Sc300 - 2jzgte

Promise this will be the last diagram but Im a visual learner. Does the indiacter light seem right, just so i know that the fans are on by choice?Sc300 - 2jzgte

No that will stay on all of the time! You need it on the centre tap, next one down but that will simply tell you there's power going to the fans. It won't actually tell you they are working.

Yes, what he said.. haha. how you have it now will keep the light on all the time. If you really want to have the best case scenerio then you will want to tie the LED into the power to the fans after the relays. This way if the relays ever went bad you would know... because the fans would no longer get power and the LED would not illuminate. That would be your safest means. But still, if the fans went bad, then there would be nothing telling you. Being that you will have it on a turbo timer then you probably do want to run the fans off the ignition. Otherwise you are defeating the entire purpose of the turbo timer. If you run if off constant power then the only control of it will be by the switch. So if you leave the switch on when you get out and set the turbo timer, the fans would just stay on... or you would have to wait in the car til the turbo timer turned off and then turn the switch off. By connecting it to the ignition, you can leave the switch on and then when the turbo timer shuts down (and kills the power to the ignition) the fans will automatically turn off. The absolute best case scenerio would be to hardwire constant power through the thermal switch to the fan relays and then have just a simple on/off switch to be able to manually turn it on. This way you would always have a protection and the fans would kick on automatically whenever they needed to. Otherwise you may accidentally forget to turn the fan on and cause damage to the motor... I almost did this on a Jeep I had. I wired the fans to only come on by the switch and didn't realize that someone had turned it off on me one day and the engine overheated. Luckily it didn't cause any damage, but it could have been a really bad day.Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

O ok. If you can pleeease do me the favor and redoing the last diagram woth a simple on off switch ? I tried but I couldnt make sense of it. ThanksSc300 - 2jzgte

Here is a diagram with a constantly wired thermal switch and a manual on/off switch. To get it to turn on/off with the ignition, connect the toggle switch input to an ignition source (fuse box, ignition switch, etc). You can leave the input to the thermal switch to constant power so it continues to run until the temperature drops below the switch value. Kenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205

Thank you so much and for putting up with me. Do I find a simple heavy duty Toggle switch to wire this up? Also would I need 40amp relays for this setup would compensate? Sc300 - 2jzgte