Liftmaster K77-50983, INTERCONNECT KIT, MIR-1
The LiftMaster K77-50983 MIR-1 interconnect kit is a legacy wiring/interconnect assembly used on specific Miracle-One swing gate operator applications. Interconnect kits are not generic wiring harnesses; connector type, pinout, harness length, and the operator control layout all matter. A damaged or incorrect interconnect cable can cause communication problems, intermittent operation, or accessory/control faults. Since this part is associated with older Miracle-One equipment and may be shown as obsolete by some suppliers, the product page should set clear expectations and guide buyers to verify the exact original part number before ordering.
Compatible With
Common Compatible Models
- LiftMaster Miracle-One swing gate operators
- Elite Miracle / MIR-1 swing gate operator applications where K77-50983 is specified
Important Compatibility Notes
This is a legacy interconnect kit. Verify the original harness number, connector style, and parts diagram before ordering. Do not substitute with a generic cable.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Interconnect kit / wiring assembly |
| Part Number | K77-50983 |
| Alternate Reference | MIR-1 |
| Application | Miracle-One swing gate operator internal interconnection |
| Compatible Operator Type | Select Miracle-One / MIR-1 swing gate operators |
| Status Note | Some supplier references list this part as obsolete or no longer available |
| Notes | Match connector style and original part number |
Also Known As / Related Part Numbers
- K77-50983
- 77-50983
- MIR-1 interconnect kit
- Miracle-One interconnect kit
- K55-09853
Technician Note
Before replacing an interconnect kit, inspect the connectors for corrosion, pulled pins, rodent damage, moisture intrusion, and previous splice repairs. Many intermittent faults come from connector damage rather than the entire operator control system.
Before Ordering Checklist
- Confirm the operator is a Miracle-One or MIR-1 style system.
- Match the original harness to K77-50983 or the related K55-09853 reference.
- Compare connector count, plug shape, pin position, and harness routing.
- Review availability because some references list this part as obsolete.
Important Ordering Warnings
- Do not cut and splice a different harness unless the wiring diagram and pinout are fully confirmed. Incorrect wiring can damage controls or create unsafe operation.
Professional Advisory
Electrical diagnosis on a gate operator should be performed with power disconnected where appropriate. For control wiring or unknown harness damage, use a qualified gate technician.
Product Questions and Answers
What is K77-50983 used for?
It is an interconnect kit for select LiftMaster / Elite Miracle-One or MIR-1 swing gate operator systems.
Is K77-50983 a universal cable?
No. It must match the operator parts diagram, connector style, and original harness layout.
Is this part still available?
Some supplier references list it as obsolete or no longer available, so current availability should be reviewed before upload or sale.
What related number should be checked?
K55-09853 appears as a related reference for this interconnect kit.
Can a damaged connector cause operator problems?
Yes. Loose pins, corrosion, or broken wires in the interconnect harness can cause intermittent faults or communication problems.
