FYI...don't know when you are trying to measure voltage, but I believe I've also read on the f150forum.com that the brake pedal must be pushed before voltage is sent/detectable from Ford's integrated trailer brake controller (ITBC).
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2022 Rockwood Signature 8324SB
2019 F350, SRW, 6.2L, 4.30 gears
Sold: 2020 Keystone Cougar '1/2 ton' TT, 29RLKWE
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