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

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.

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.