DC Motor Speed Controller Universal DC 12V 24V 10A Electronic Stepless Speed Regulator Switch for Car Truck Fan Heater Control

Works great for my camper bathroom fan. The circuit board went bad and would only work on speed 1. New circuit board was over $100. Removed circuit board and added this variable switch and 2 way taped it to the shroud. Only directions are on the Amazon add and they are not great.This worked for me.Black wire to negitive/ groundBlue wire to negitive/ ground on motor or whatever device you are hooking up to.Red wire to positive input and positive on fan or device you are hooking up to.

The fan in my Dickenson Diesel Heater needed replacing as the stem of the control knob had snapped off. Replacement OEM was over eighty bucks with shipping and this little device was less than nine. The original had only three speeds whereas this is infinitely variable from, zero to full power. The zero point clicks completely off.The original was more strongly constructed with a metal body, whereas this is made mostly of plastic with a metal stem; however, the device doesn't really come under much stress, so it's not a major consideration. Of course the upside is that I have far greater control of the fan so I can dial it in perfectly. The lower power settings can be employed as a damper in those situations when the wind isn't co-operating and there is the occasional downdraft. A three-speed fan is next to useless in this situation.The wiring was a breeze thanks to a very detailed account by one of the reviewers, Ryan Shumaker. Thanks Ryan! The operation of the controller feels silky smooth without any play whatsoever, which surprised me given its price.Only time will tell if this was a wise purchase but at ten percent of the replacement cost of the original and given its superior performance, I think it's only a tiny gamble.

Received in package well protected and without damage. NO installation information. NO connection information. Three wires hanging out of nice box advertised as a speed control (rheostat) for 12 volt fan. Any 12 volt fan will have only two wires! What to do with the third wire? Who knows, I tried 6 possible combinations from a known good 12 volt source with both positive and negative combinations. The fan would not operate until I once again wired it without the controller. The single speed fan is now operating.

Does exactly what I need and works well, but wanted to post this photo and info for anyone confused on how to hook it up. The instructions are garbage.Black wire - DC negative/commonBlue wire - Device negative/commonRed wire - DC positive and device positive

Simple and works like it's supposed to. Used it to power a 3A 12V diaphragm pump, hooked up to a 3A 12V wall adapter for LED's. Powered on, pumped water great, the speed control worked flawlessly.I wish it came with the wiring diagram in the box but... I mean, the picture on the Amazon page is easy enough to follow.

I use this controller for a 275-cfm blower that would normally eat over 4 amps from a 12-volt battery. At lower speeds, the blower takes less amperage and is quiet - compared to full blast. I don't even need full blast, so the controller was needed. Using this to move air up through the house as kind of an attic fan - the controller can dial in the air movement. Since I am running the blower on a solar energy setup, saving a little amperage, not needing lots of air, the controller fits right in. The price is also right so this is a recommend.

Extremely large for a simple controller. Can't find that much space for it to fit. Even considering the aluminum cooling plate the size is a killer.

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