The LiftMaster 041A7790 (also identified as 41A7790) is a genuine OEM Dual Wire Harness designed for the internal powerhead of residential garage door openers. This critical electrical component connects the motor, logic board, and other peripheral devices, ensuring synchronized power distribution and communication throughout the system.
Over time, internal wiring can become brittle or damaged due to constant heat cycles and mechanical vibrations. If your opener is experiencing intermittent sensor errors or power delivery issues, replacing the harness with the LiftMaster 41A7790 Dual Wire Harness is a professional-grade solution to restore your Access Control system's integrity.
Key Features & Benefits
• Factory-Spec Connectors: Features precision-molded, "snap-in" plugs that attach directly to the logic board and motor terminals for a secure, solder-free connection.
• Dual-Circuit Design: Engineered to handle the specific voltage requirements for both the drive motor and secondary components like the RPM sensor or light sockets.
• High-Heat Insulation: Constructed with industrial-grade jacketing to protect the copper conductors from the high-temperature environment inside the motor housing.
• Durable OEM Build: Manufactured to exact factory lengths to ensure clean cable management and prevent interference with moving internal gears.
Compatibility & Installation
This harness is specifically designed for modern LiftMaster and Chamberlain operators. It is most commonly found in DC motor series that require more complex internal wiring than legacy AC models.
• Supported Models: Frequently used with the LiftMaster 8550W, 8550WLB, 8360W, 8587W, and the Chamberlain HD950WF and WD1000WF series.
• Technician Tip: When installing the new harness, follow the original routing path exactly. Use existing plastic clips and standoffs to keep the wires away from the drive sprocket and the travel limit assembly.
If you're replacing the harness due to a "surge" or lightning strike, I can also find the compatible Logic Board for your model, as those components are often damaged together.
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