This update brought to you by Goose Island, "Mild Winter"
I stared tonight by addressing this transmission relay. The Jeep had no wiring related to any kind of transmission relay. I assume it's not needed for the 30RH/32RH because they are controlled hydraulically, whereas my 46RE is electric.
(Bangintin; you said earlier that the relay was part of the harness. It is integral to the harness, but is not a part of it, per se. Your statement confused me because I expected the relay to be wired and packaged separate of the PDC. The transmission control relay is in the PDC, with the other relays. Perhaps you were too busy being on vacation to clarify. )
I pulled the relay from the old Dodge PDC for the transmission control. Once I identified the correct wires, I found an empty spot in the Jeep PDC:
I followed the wires on my new harness and reviewed the schematics to make sure I had the correct wires for the transmission control relay.
I found a unused, fused power feed for my new relay location. I used the rear defrost, an option my Jeep is not equipped with. I removed the wire from the relay socket it would normally go to and cut the end off. After testing fitment in the PDC socket, I replaced the end with a normal spade plug from my junk in the garage. I did this for each of the 4 wires I needed.
Here are the connections I made. Maybe someone will find this useful.
My code is: Relay pin # = relay post # = circuit color (junction) where it goes.
Note, I chose the rear defrost wire to power this circuit because it was of adequate size for my circuit. The Dodge FSM lists a 20 amp fuse feeding this relay. The defrost circuit I used for this is set up for a 30 amp fuse. I contemplated using the ABS wiring, another thing my Jeep wasn't equipped with, but that was only a 10 amp circuit.
- Pin 1 = Post #85 = A30 22PK (C130) to PCM C2 Pin 30
- Pin 2 = Post #86 = T125 18DB (S180) to: LDP, C130, S116, PCM C3 Pin 25, Generator (-) ((This is the "Generator Source" on the PCM))
- Pin 3 = Post #30 = BK/VT ((This was originally fuse #15 in the Jeep PDC, normally used for the rear defrost.))
- Pin 5 = Post #87 = T16 18RD (C130) to transmission solenoid
- Pin 4 is unused. This is post 87A and normally closed.
After that, I put the relay in place. Even without the wires connected, the relay stays put, but I had to put pressure on the relay to keep it in place when connecting the wires in the back of the PDC. It took quite a bit of pressure to ensure the spade clips were seated on the blades of the relay. I took it apart a few times to make sure I knew they were seated well.
From the visible side of the PDC, it looks like it belongs there:
One downside is that I will not be able to simply pull out the relay and insert a new one if it ever needs replacing because the spade clips don't "click" and lock into the PDC socket's plastic housing. I believe there is no chance that the wires will come loose, but I will have to tear the PDC case apart if I ever need to replace the relay. If I was trying to be *perfect* I would find the correct clips and use those instead.
Feel free to applaud.