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Last week I took the truck on a 1400 mile round trip from Southern California to Northern California. The exhaust brake and downshifting was fantastic. No trailer connected. Thanks Ozy! Superdawg

When I upgraded my compressor for my PRXB, I moved it to the outside frame rail, under the front passenger door. 100% duty cycle. Not in freezing temps very often.

Are these the ones?: ac control led lights 5013815AA. I picked this up from a previous thread on TDR years ago.

Finished last weekend with the install of the LED showing torque converter lockup and cleanup of the wiring. I can definitely feel the EB come on in 4 and the 4-3 downshift. I feel the 3-2 downshift but the EB usuallly shuts off at 25 mph. Slowing down for turns, I feel the EB on in 2nd but it...

Thanks for the LED light info. Also, if you know, does switching between the Smarty Jr. programs have any effect on the ECM controlled brake operation? Using the stock program currently.

You’re absolutely right about that part being hard to find. I found it at firsttruckparts.com. It wasn’t cheap, but I didn’t really have much of a choice. By the way, which wire was it to tap into for the torque converter lock up indicator light? Is it the wire coming from B 39 or B 42?

Good news! I cleared the code (PO478) I replaced the relay top with a Dorman 30a 4 pin relay without a diode. I did a hard reset on the batteries: disconnected all pos and neg cables from the battery terminals and connected the pos and neg cables for 30 min. I put it back together and started...

Well, the solenoid is not activating the exhaust brake.

Amazon: DaierTek 12V Relay with Built-in Diode & 12 AWG Harness Socket 30A/40A Heavy Duty SPDT 5 Pin Relay Switch Waterproof for Automotive Car Marine Boat -8pcs

Relay used: I did have some trouble with 85 and 86 during this whole process. I believe it is correct now.

3. checked solenoid wires (solenoid disconnected): 0 volts w/ ignition and EB on. Should be reading 12 volts between wires. The two wires going to the exhaust brake solenoid. C11935 pnuematic solenoid.

When the wiring harness to ECM B bundle was disconnected and batteries disconnected, I checked continuity from B39 to yellow wire going to stalk switch. It was good.

As mentioned earlier, I reconnected the (TC lock up wire?) at the transmission connector. Codes went away. 1. Limp mode is gone. 2. Light on stalk switch glows when switch is pulled out. 3. It could be me and I have not driven the truck in a while but it seems to be running the more agressive...

Update: I reconnected the wire at the transmission connector and both codes went away. No codes showing. :) Progress. EB not turning on. Going through electrical troubleshooting list per Jacobs install instructions now.

How does it feel to be correct, Ozy? I reread the instructions at number six several times. After what you said again about splicing the wire, I read it again. Apparently I did cut that wire at the transmission connector according to the install instructions. When I removed the harness, I just...

I had the trans controller. I installed it many years ago and still have the instructions. I apologize for not adding that earlier. When I tried to rewire it the first time a couple weeks ago, I used the first Pacbrake diagram in your latest post with two relays. That is where I think I goofed...

This weekend I will double check to see if I removed all of the Pacbrake harness. I will double check (second opinion) I followed the Jacobs diagram with my wiring and the relay. I wonder if it is possible the P2769 could be collateral damage if the ECM got burned at B42?

The whole Pacbrake harness is gone.

I agree with the P2769. That one does not concern me as much as the P0478. This started when I likely wired the relay wrong and could have sent 12 v into the ground. From the Pacbrake harness, I cut and sealed the wire spliced to the wire at Pin 12 in the ECM. I removed the Pacbrake connector...