Recent content by bmtndog

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    Vapor Lock

    Good point. Locally, I fill up with a high quality gas. But on the road, you don’t always know what you are getting.
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    Vapor Lock

    No gas cap on this model
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    Vapor Lock

    Thanks for all the inputs. The truck is a 20015 Limited 4x4 with the 3.5L Ecoboost V6 engine, 6 speed auto transmission. I am testing fuel pressure on Wednesday. I've been able to "solve" this issue (meaning I could drive without any issues subsequently) by filling the gas tank and pouring...
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    Vapor Lock

    Well, we did fuel pressure tests both times, and it was normal. Could be intermittent, I guess. One of the codes thrown was low pressure, but this could not be duplicated in the shop.
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    Vapor Lock

    I have a 2015 Expedition that has suffered vapor lock a couple of times over the past year. Once was after sitting at a road construction stop for 20 minutes on a 100°+ day. Another time was on a day that was 85° and we had stopped for lunch while on a road trip. The first time, I had the truck...
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    What causes "Trailer Disconnected" message?

    Solved. It was not poor grounding or LED lights. I finally had a chance to tow the trailer to a dealer (2 hours away). There, we were able to connect and tow an identical trailer with the Expedition. There were no trailer disconnects. This finally and definitively pointed to the trailer as...
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    What causes "Trailer Disconnected" message?

    Yes, it does. It is the type with a cylinder in a sleeve with the cylinder connected via a cable to the tow vehicle. If the cylinder gets pulled out of the sleeve, the brakes go on full. I've tested that it works.
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    What causes "Trailer Disconnected" message?

    I think the pin numbers are different although the locations are the same. The Ford manual shows "3. Blue" = "Electric Brakes", even though the photos I've seen online call this pin 2 on the connector. So, I think it is important to go by the color code, not the pin number. Doing that, the Ford...
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    What causes "Trailer Disconnected" message?

    Okay. That is weird. I did not think to verify that pin 3 is to the brakes! I just assumed it was. Bad assumption. So, we are back to the theory that the LED lights may be the issue. I am hauling the trailer back to the dealer in January sometime where they have more trailers we can pull to...
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    What causes "Trailer Disconnected" message?

    Based on some info from Ford, the problem can only be with the brake controller wire or ground (below), so that rules out the lights. Current thinking is that one or both brake modules is "bad" in that underway, when the tires are spinning, the resistance is high. Can't explain that yet, but I...
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    What causes "Trailer Disconnected" message?

    LED lights on the troublesome trailer. Normal lights on the trailer that worked. We also wondered about the LED lights, but they don't dim when this happens (from the perspective of a following car), all connections are good, no significant voltage drop when standing still...
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    What causes "Trailer Disconnected" message?

    A quick update on this. I pulled a different trailer with the truck and did not get the Trailer Disconnected error. This seems to narrow the problem to the trailer. However, after about 10 hours of work on this, we can't find anything wrong with the trailer. All wiring is sound. We've tried a...
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    What causes "Trailer Disconnected" message?

    Grounding sounds like such a likely candidate. Is there any way this could be a problem with the truck wiring, such that the control system in the truck is not well grounded to the truck chassis? I ask because there is one more piece of data for this puzzle. Last May, when the truck was...
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    What causes "Trailer Disconnected" message?

    Tried grounding experiment with no success Over the weekend I spent several hours on an experiment to test the grounding hypothesis. I took about 15' of 16 gauge wire with charging clips attached to each end. I connected one end to what seemed like it should be a good ground on the chassis of...
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    What causes "Trailer Disconnected" message?

    I will check ground I bought some wire and alligator clips this week. This coming weekend I'll rig up a jumper between the truck body and trailer body, and will let you know if that makes a difference. I guess the challenge will be finding good connection points.
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