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Re: Depinned engine harness --- now ... ??
I think you've got it.
Some of the problem may be the two fan controls in the PCM, which is a little confusing- this isn't two separate fans, this is to step the fan speeds
Please forgive me if you already know this.......
All of the car applications of the LS engine and some of the trucks have two speed fans. Using a couple of relays, the fans first come one at a lower temperature commanded by the PCM. The two fans are wired in series by the relay so they each see 6V when the first pin is grounded and because they're dc motors they'll run at half speed,
At a higher water temperature, the second pin grounds and the relays place the fans in parallel so they both see 12V so they will run at full speed.
It is easy to make the 6v/12v fan speed control out of a couple of relays. If you have room on your radiator for two fans and HPTuner to set them up, it makes for a much less noisy cooling fan.
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