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I appologize for a wait. This was in the wrong category it looks like. It looks to have just been moved from the CAT bulldozer to trucks. Not sure why it wasn't moved sooner.
To understand, you checked the cruise in the ET and it is showing you are getting the switch activation in the ECM, correct? What about the clutch? Are you getting the activation and deactivate with it?
On the 2001 379 Peterbilt, I don't think there is a parking switch. I know the 2005 is the change over year and it has one, but I don;t thingk that year does.
Have you checked the brake switch? Unplug the wire going to it to break tha circuit and then see if you get the high idel. If there is even .2 volts going through that switch, it will cut the cruise, even though it isn't enough to power the lights on. That is a big problem on the Petes with cruise issues.
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