MK VIII fan switch issue-need help
 

I installed a fan switch that is for a Lincoln Mark VIII and it will not activate the control for my fan.

Any ideas why?

My fan is a Lincoln Mark VIII.

Fan Controls: Relay's & wiring from Hollister, also got a 180* & 190* swithches from them.

The Hollister stuff works.

The reason I need/tried the stock Lincoln switch is because I have converted to fuel injection and needed to run a 190* thermostat and the Hollister parts just don't like a 190 thermostat.

Bottom line is, I need low speed to come on at 190-192 and high speed to come on around 200. The factory MK VIII switch supposedly does this in the Lincoln car, but it won't turn on the fan in my 78 F250 w/TMI 400.

I can run from now (October) until summer when it gets hot with only low speed on the fan coming on with the Hollister 190* switch without issues, but I need/want to get high speed working so I can move on to other projects.

So what's the deal?

53 views and zero input?

I'm now wondering if the Lincoln temp switch might need to be grounded?

Any ideas?

Pretty sure the MarkVIII fan is computer controlled and not switched from a temp sensor.

The computer actually ramps up the speed of the fan and will dial back and increase the speed as needed.

Josh