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From what I have seen in my application, the actual coupling of the clutch follows a logarithmic progression. Based on my Flex-a-Lite controller (60% duty cycle), 2000 RPM engine speed, 200 RPM initial fan speed (2500 RPM at max coupling), the first 10 sec is very slow (10-30 rpm/sec --> 400...

Personally I think the issue is more with the capabilities of the controller, specifically the ramp curve of the Mishimoto. In my use case, I am running a Flex-a-Lite 31163 Variable Speed Controller. The ramp curve starts at 60% duty at set temp and increases to 100% duty 10 degrees F later. It...

Correct. On the 2010 Express Van, the ground is Pulse Width Modulated through the ECM. This is how fan duty cycle is controlled. Since there are variations in clutch wiring colors (OEM, AC Delco, others), best way to identify wiring is via connector pin assignments (A through E) as shown in...

The letters are there (first photo). They are really small lol... A = Blue = ground (pwm) B = Red = +12v power

Here are the wire assignments from A (left) to E (right) based on your first photo: A and B control the fan. C, D and E is for the speed sensor. Connector Pins A. Fan PWM ground B. Fan hot C. Low reference D. Signal (speed) hall effect sensor E. +5V reference

2003 Silverado 3500 Dually.

I mounted mine on the TCM cover.

Well, since I discovered this thread about 1 1/2 years ago, I finally completed my switchover to an EV clutch about four months ago and I do have to say, I'm extremely impressed with the performance so far. The thermo clutches just did not react fast enough under very heavy loads and an...