E4OD to ZF5 - In Process
Tuned
Joined: Mar 2017
Posts: 417
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As a side note - if you can find where the tan/lt blue wire from the clutch interlock switch leads (possibly under the hood) you might be able to make the connection there. We could not find where that wire leads in the automatic truck. When you look at wiring diagrams, like the one that Hussler posted, it shows the tan/lt blue wire going to pin 29 of the PCM. That's for manual trucks...but that wire does NOT lead to pin 29 on the automatics - pin 29 comes from the tan/white wire from the O/D cancel switch. We don't know where the tan/lt blue wire goes. We know it goes to the main harness plug that goes through the firewall...but we don't know where it goes from there.
The tan/white wire from the OD switch on the automatic and the tan/blue wire from the clutch safety swing are both direct lines from their switch to the firewall plug. To make this process clean and easy, I popped the red casing out of the firewall plug, released the tan/white wire, released the tan/blue wire, and put the tan/blue wire into the pin location where the tan/white wire had been. I then taped the tan/white wire out of the way to the harness and reinserted the red plastic piece into the end of the firewall connector. I only did this because my truck is still apart so it was easier than cutting and soldering the tan/blue into the tan/white. This was on a 97 F-250 PSD that came with the/E40D. The wiring for these switches was the same for the underdash harness for the PSD and the 1996 460.
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