How to Activate 12 Volt Accessory Circuit of 2021 Ford F-350 to Work with EOH Actuator

Updated 05/01/2025 | Published 04/30/2025

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10 Gauge Wire - Blue Primary - Per Foot

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$1.65

40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

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$9.85

Question:

21 f350 trailer brakes not working. 3 axle electric over hydraulic disc brakes. Truck is not sending 12v power to battery which is needed to work. I am wondering what your recommendation is to fix it. Sounds like a common deal on ford integrated brake controller

asked by: Jeremy S

Expert Reply:

Hey Jeremy, the simplest solution would be to bypass the 12 volt accessory circuit of your 7-way by running a wire directly to it like with the part # 10-1-1 for wire (sold by foot) through a breaker like # 9510. This would allow this circuit to be active all the time which would allow your actuator to be active like it needs to be. Does your controller have a hydraulic mode too that maybe you haven't activated?

expert reply by: Jameson C

Jeremy

5/1/2025

Thank you, I did set it to electric over hydraulic. I will check with ford to see if they have an update. Otherwise I will wire it directly like you said.