How to Use the Coiled Adapter 7-Way to 5-Flat Part # HM47025 with a Reverse Lockout Solenoid

Published 10/26/2018

Products Featured in This Question

Hopkins Heavy-Duty Trailer Coiled Wire Adapter 7-Way to 5-Way Flat with Nite-Glow

(55)

$49.94

Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators

(16)

$64.66

Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout - Disc - Zinc - 2-5/16" Ball - 8K

(129)

$375.79

Question:

I think I know what the problem is. I was reading the Kodiak disk brake manual and it explains that if you put the truck into reverse while backing uphill, even though the solenoid might prevent more fluid from getting pumped to the wheels, there is already some fluid trapped in the line that can prevent the trailer from backing up. Forcing it can damage the actuator. Would the manual reverse lockout kit DM5939 work on my actuator: Item # DM8750311

asked by: Newton

Expert Reply:

I assume you are referring to the reverse lockout solenoid wire and if that is the case then you would need to wire or check that the trailer side trailer connector has this wire on the far left pin which you can see in the attached photo of similar to the Hopkins Coiled Adapter 7-Way Flat Pin Blade to 5-Flat # HM47025. This pin should then match up with the reverse light circuit on your vehicle's 7-way.

expert reply by: Conner L

click to enlarge

Newton

10/26/2018

Conner L.

10/26/2018

Yes, the Manual Reverse Lockout Kit part # DM5939 is specifically designed for the Demco Hydraulic Brake Actuator part # DM8750311 so it will work well for you. I also spoke with Demco and confirmed that the remaining fluid in the lines can in some cases still cause the brakes to lock up. The Manual Reverse Lockout Kit should be exactly what you need as there is a physical barrier that stops the slide from compressing and sending fluid to the brakes.