Question Mean:

The diagram you posted on the first page of this thread, it is for a viper kit? Is the relay on that diagram applies to the controller you got? If not, that diagram is meaningless. Otherwise, let me translate that diagram for you.

The relay:

85 - is Postive side of magnetic coil
86 - is ground side of magnetic coil
30 - is Positive side (common) for 87 and 87A
87 - is Normally open between contact 30 and 87 for high speed.(change to close by20A switch cab when in on position).
87A - is Normally closed between 30 and 87A for low speed. (change to open by 20A switch cab when in on position).

Who drew up this diagram? Judging from the bold lines on contacts 30 and 87, I would logically assume this is the normally closed or normally open contacts. Only way to confirm this is using a ohm meter on the relay.

My personal preference is not to use the switch at all. use the thermostat for the high speed of the fan. And use the positive live wire from the A/C unit to control the low speed. This way, have total automated control of fan.

This way, when A/C is enabled, it will enable the fan in low speed. When the temperature reaches the set point on the thermostat, it will auto switch the fan from no speed or low speed to high speed.

 

I'm not using the intial wiring diagram at all since I bought a controller that was supposed to take care of this headache, I'll post up the instructions I got again. Keep in mind I have pulled all of the wires that are supposed to be switches and also cooled down the temp probe and it still runs constant, whether the D is on or off.

I was just looking this over again, Could my problem be because I am wired into the fan on both the low and high speed from the controller. It looks like it is supposed to be for a dual fan setup. I just figured the lower speed would stay on (with the ac) and the high speed would kick on as needed.

[IMG]local://upfiles/37840/1D66B8EA2D624EEF8747DE87CE5483BF.jpg[/IMG]

 

So I have everything for the elec fan now. How do I know which wire coming off the AC comnpressor is the positive?

 

That's may be the problem. Looking at the schematics, this controller is not setup for a 2 speed fan, but 2 separate fans.

DO NOT CONNECT both of the power leads to the high/low connectors of the 2 speed Mark fan. You may risk shorting out the motor or something worse.

 

If you have a DC voltmeter, all you have to do is put one probe to the frame of your D. Then the other probe, touch the lead going to the A/C compressor clutch, if you get power, that is the positive lead, if not, then there may be another lead and test that one.

 

I'm gonna go over to Summit soon here then and pick up a better controller. Hopefully they have something otherwise I'll be stuck with this like this on my offroad trip. I have also been hitting a few degrees higher than 200 when I run the ac. Not a big deal but I think it's high time to get another 180* t-stat and go to town.

 

http://dccontrol.com/

 

My fan control has 2 wires for dual fans. My fan has 2 wires for high and low. I called the maker of the fan and they said to just hook up the first fan wire to the high speed of the Mark VIII and not use low. Does that sound OK?

I'd like to know if I could hook the 2 wires from the control to the 2 wires of the fan. Doesn't the second fan kick on like the high speed would?

 

I have the fan hooked up. The fan kicked on only with the AC on. I have to mess with the probe and setting. Right now I have it rigged though.

I STILL NEED TO KNOW WHERE TO HOOK IT UP TO AN IGNITION SWITCHED 12V SOURCE

SO I f you have any ideas I would appreciate it!!! Right now it has a switch and is hooked up straight to the battery. Not ideal when the key can do it easier than popping the hood. It freed up alot of space and really wasn't that hard to hook up. I leave wednesday for the trip. Upon my return I'll get some pictures and details of the install, along with my heater core bypass and my new custom CAI.

Thios thing ROARS that's for damn sure!! My wife hates it.... Wonders why she has to drive the redneck D!!!

 

Well, now it stopped working. No idea why.... was coming on with the AC and now nothing.

I think the controller isn't what I need. I think I'll try my hand at wiring it like you see here:
https://dodgeforum.com/m_817322/tm.htm