How are you wiring your dual electric radiator fans? Without external fan controllers, using LS PCM

[paradigm]

How are you guys wiring your dual electric radiator fans?
My LS PCM from PSI conversions apparently has low speed and high speed fan control wires, which I believe provide a ground to pin 86 on the fan relays.
I bought the 98-04 Dodge Intrepid radiator fans, which has both fans wired together through a harness. Should I cut off the harness and wire each fan independently to their own relays that each get their own signal? I want the high speed fan to only turn on when called on by the PCM.

For each fan, they would get their own relay:
Pin 86 - PCM ground signal
Pin 85 - Ignition?
Pin 87 - to Fan power
Pin 30 - constant power, fused 40A to battery

Does the above seem correct?

 

[383_StealthRam]

It depends what you prefer...

You can wire dual fans so lo speed means one fan on, second fan off and when hi speed is commanded by PCM the second fan then comes on. Two relays, each controls one fan, they both are either on or off full speed.

Or you can wire the fans in series/parallel so they BOTH run at half speed (splitting voltage) in lo speed mode, then when PCM commands high speed they both jump to full speed. This requires three relays in order to switch the fans wiring from series to parallel circuit for the lo/hi speed respectfully.

 

[81cutlass]

Does your intrepid fan have relays on the fan or not? There is a standard and HD cooling option.

The fans are 2 coil so if you power 1 coil both fans turn on low and power coil 1 and 2 they turn on high.

My intrepid fans have 2 wires, a black, yellow, and green. I have 1 relay triggered with the low speed fan signal from the LS ECU to the yellow wire for low speed and a second relay connected to the green wire for high speed that is connected to the high speed fan command from the LS ECU. I left the OEM harness on the intrepid fan and put a 3 pin weather pack connector from the fan to the chassis, so if I want to pull the fan/rads I don't need to pull off any wiring. The OEM intrepid fan has a connector that I didn't have a mate for so I just replaced the connector with one I had on hand.

 

[paradigm]

It depends what you prefer...

You can wire dual fans so lo speed means one fan on, second fan off and when hi speed is commanded by PCM the second fan then comes on. Two relays, each controls one fan, they both are either on or off full speed.

Or you can wire the fans in series/parallel so they BOTH run at half speed (splitting voltage) in lo speed mode, then when PCM commands high speed they both jump to full speed. This requires three relays in order to switch the fans wiring from series to parallel circuit for the lo/hi speed respectfully.

I am leaning towards wiring it as in your video with the 3 relays - I just do not understand which of the leads on the intrepid 4 pin fan to feed into. There is a red wire, a blue wire, a black wire and another red wire. Each motor has 3 wires - red, blue and black.

 

[paradigm]

Does your intrepid fan have relays on the fan or not? There is a standard and HD cooling option.

The fans are 2 coil so if you power 1 coil both fans turn on low and power coil 1 and 2 they turn on high.

My intrepid fans have 2 wires, a black, yellow, and green. I have 1 relay triggered with the low speed fan signal from the LS ECU to the yellow wire for low speed and a second relay connected to the green wire for high speed that is connected to the high speed fan command from the LS ECU. I left the OEM harness on the intrepid fan and put a 3 pin weather pack connector from the fan to the chassis, so if I want to pull the fan/rads I don't need to pull off any wiring. The OEM intrepid fan has a connector that I didn't have a mate for so I just replaced the connector with one I had on hand.

No relays on the intrepid fan, its a standard fan I picked up off of ebay.

However it sounds like yours has 3 pins on the main harness? Black (ground), Yellow (low speed) and Green (high speed)? Is that correct?

My intrepid main harness has 4 pins - red, blue, black and red. Each motor has 3 wires - red, blue and black. I am assuming that red and blue are the two hots, and the black is the ground, but what would the second red be for?