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| - I'm keeping my rating to one star. Here's why:
They could not provide a rational explanation of what caused the EDL (Electronic Differential Lock) switch to fail on my 2013 F150 4WD truck.
The vehicle had no problems when I stored it for the summer, but when I brought it out of storage this fall the differential was locked with no way to unlock it (the switch had failed).
I asked what caused the switch to fail while in storage. They weren't too sure but blamed it on a "high resistance wire" which they replaced.
Well, I can't accept that as a root cause or even a contributing factor. Wires don't change their resistance characteristics (except minutely with temperature or catastrophically when fused under an electrical over-stress condition).
I was thinking maybe rodents got to a wiring harness somewhere but they said they checked for that with no result.
Perhaps it was a bad connector, orders of magnitude more probable than a "high resistance wire".
In the world of failure analysis, where I made a living for 38 years, they call this a "no find".
My experience is that a "no find" never makes a customer happy, and today is no exception.
If I'm lucky the problem at the unfound root cause will not recur and we will never know what really caused the switch to fail.
More likely it will fail again. (SOL's law, an extension of Murphy's Law, says it will fail at the most inopportune time, in the worst possible way.)
So next week I must use the truck to pull a travel trailer 2500 miles to Vermont.
Wish me luck!
PS: my service manager did his best but probably doesn't have nor does he normally need an engineering degree to understand issues like this.
However, I seem to remember something about quality being "Job One" at Ford and having been held to strict standards as a supplier.
Now that the shoe is on the other foot, I seem get nothing but BS, at least from this dealership.
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