06-11-2017, 08:27 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,371
M.O.C. #4831
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If your truck has the trailer towing package, it comes with the fuse. You need it if it is missing. I believe your shop foreman is blowing smoke. I don't believe any truck including the 2017 Ford senses the trailer battery voltage. The output of the alternator is made available on the "12V charge line" circuit if the fuse (and relay) are functional. You can check the voltage on Pin 4 of the truck's plug.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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