Installing the Harness
Now comes the fun part, splicing the transmission/TCU harness into the YJ PCU harness. While the PCU is mounted in the engine compartment, the TCU isn’t weather proof and needs to be mounted inside the vehicle. Since the PCU is located on the driver’s side of the firewall, I decided to route the TCU harness through an existing grommet in the same vicinity. I pulled the grommet out and cut a cross shaped slit through which the TCU connector would fit.
I then attached the TCU up under the instrument panel near the gas pedal. I routed the TCU connector through the firewall and replaced the grommet. All is neat and tidy.
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