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2000 WJ 4.7. Has anyone been successful installing a way to turn on the factory fan with a switch? From what I understand, the relay is pulse width modulated from the PCM. I’m looking to actuate 100% for long highway pulls when the mechanical fan doesn’t feel like engaging. Everything is functioning properly in the cooling system, just runs around 215-220 on long uphill grades after installing winch bumper. I would imagine either powering or grounding the control wire to the relay, then installing a diode so voltage/ground does not make it back to the PCM, that way the PCM can still control the fan normally around town for A/C operations with the switch in the off position.
Thanks!
you wouldn't ever send a PWM signal to a relay coil, just on or off. Switching a relay rapidly is a great way to ruin it.
I'd just wire a switch in parallel to the PCM output. Figure out if it is sourcing or sinking.
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