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Old 08-04-2018, 07:45 AM   #1
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Question Mystery Switch in an F-350

I originally posted this on a Ford Truck forum but I thought some of the knowledgeable folks here may know.

My friend just bought a 2016 F-350 with a few aftermarket additions: light bars, air bags, aux reverse lights. There is also a switch to the left of the steering wheel and we have no idea what it does. It is a rotary dial that seems to have 4 positions it will "click" into. We don't think it's related to the light bars or air bags because we've found the controls for those already. Some other info: the truck is set-up to tow a 5th wheel trailer and has some lights installed inside of the bed that we don't know how to turn on.

Any ideas what this thing does?

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Old 08-04-2018, 10:33 AM   #2
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Might be the controller for a multiposition performance chip (various HP gain tunes, towing tune, economy tune, hi idle,...,).


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Old 08-04-2018, 10:54 AM   #3
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An switch not installed by Ford could be for anything. If nothing obvious turns on or off, you probably will have to follow the wires.
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Old 08-05-2018, 11:23 AM   #4
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Thanks for the thoughts and suggestions.
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