Does Hydrastar EOH Adapter Module for GM Brake Controllers Install On Truck Or Trailer

Question

Question:

Does this install in the truck or on the fifth wheel?

asked by: Michael A

0

Expert Reply:

Hey Michael! The Hydrastar Electric Over Hydraulic Actuator Adapter Module for GM Brake Controllers # HYD29ZR will be installed on the trailer side. This is designed to be installed on your brake output circuit between the brake controller and the Hydrastar actuator. See the attached photo.

The module should be ~10" from the actuator. Official installation instructions from Hydrastar are "cut the blue wire approximately 10" from the actuator. Crimp the module inline — wires are labeled for direction. Heat shrink the connections. Arrow on the diode points toward the actuator."

What kind of 5th wheel are you towing?

expert reply by: Robin H

0

Adapter Module Wiring Diagram
(click to enlarge)

Michael A.

8/24/2026

Thank you for your reply. I am towing a 2023 Montana with a 2026 Chevrolet 3500. Even when I turned the solar off, I still lose brakes.

Robin H.

8/25/2026

@MichaelA thanks for the additional information! The # HYD29ZR will allow your Hydrastar system to work with the factory brake controller in your 2026 Chevy 3500, and will prevent those brake errors from popping up so you can safely tow your Montana.

David M.

8/25/2026

@MichaelA I installed mine on the camper blue brake line since it is the only trailer I have with the disk kit. Loving the hydraulic system. HUGE difference.

Robin H.

8/25/2026

@DavidM thanks for sharing! Glad to hear the Hydrastar adapter and brake kit have been working well for you.

Greg

8/25/2026

I put mine on the trailer and it works fine.

Robin H.

8/25/2026

@Greg glad to hear it, thanks for the feedback!

Bruce J.

8/25/2026

Hydrastar instructions indicate installing the adapter within 10” of the actuator in the brake controller output conductor. Just cut the blue wire near the actuator and install with the include crimp connectors. Polarity matters. Quick, simple fix.

Robin H.

8/25/2026

@BruceJ thanks for the feedback! I added those installation details from Hydrastar to the answer. Appreciate the additional information.

Dave K.

8/25/2026

Easy to install in camper near hydrastar unit. Tip is H end goes to hydrastar unit. T goes to truck.

Robin H.

8/26/2026

@DaveK thanks for the tip! That makes it nice and easy to keep the direction straight during installation.

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Does Hydrastar EOH Adapter Module for GM Brake Controllers Install On Truck Or Trailer

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