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Adapting 2017 tow mirror to my 2018 XLT

 
Old 03-05-2019, 10:40 PM
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I realize everyone has different truck configurations, and needs. Hopefully everyone that needs to fit a tow mirror onto their 2018+ F150 will find a kit that will work, without too much trouble. I got the wiring figured, just need to find a good spot to mount the sensor.

Attached is a PDF file listing the wiring diagram for the RH mirror for a 2018. #2 and #6 wires are for the AAT, but on the LH mirror I believe the #2 and #6 wires are used for the auto=dimming mirror function if truck had it (mine does not).

Hope this helps !
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File Type: pdf
f150 RH mirror wire diagram.pdf (347.1 KB, 10 views)
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Old 03-06-2019, 05:14 PM
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My Trail Ridge kit came with a side marker and puddle/spot kit to adapt these functions to trucks that did not come with these functions. Pics of the kits for info:




The Trail Ridge kit from 1A Auto impressed me with the overall fit and quality, and completeness of the kits/directions. The driver side mirror was basically bolt on, the passenger side mirror required a 2 wire AAT t-tapped into the truck door harness #2 and #6 wires. I need to find a spot to permanently mount the AAT sensor, but also have a GM AAT sensor on order to test out. The size and shape of the GM sensor might make for an easier mounting. Will update as it arrives.
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Old 03-07-2019, 07:59 PM
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Ok, just to finish this off, I tried wiring in a GM AAT instead of my Ford unit, thinking it is more compact and perhaps easier to mount somewhere on the tow mirror assembly. I guess the GM unit is calibrated differently than the Ford unit. The Ford AAT reading 56 deg, while the GM unit read 86 deg. Decided to go with the bulkier Ford sensor, and mounted it onto the inside of the door flange of the mirror. Not much open space on the backside of the door mount, trimmed the sensor a bit, barely fit.

You can see in the picture just the tip of the AAT sensor is showing. I used some silicon caulking on the back side, so this is waterproof now. Reads fine currently, as our weather is very cool, and been getting rain showers. I would guess that the black housing that I mounted the sensor into will transfer some heat on a sunny day to the sensor and give a falsely warm temp. Will have to wait and see how much the temp reading is affected. Sitting in the hot sun, it may be pretty significant until some air flow cools things down.

Regardless, not much choices for me, so this will be how it goes. Good thing this sensor doesn't control anything with the engine system, like a IAT. I really miss having auto a/c in my F150, so manually adjusting cool/warm air flow is how things go now anyway.

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