LiftMaster K76-37298 Alarm With Wire Harness for RSL12U Gate Operators
The LiftMaster K76-37298 alarm with wire harness is a service replacement for the audible alarm circuit used on select LiftMaster RSL12U slide gate operator systems. The alarm is part of the operator safety and entrapment-response system and may sound when the operator detects a problem such as an obstruction, abnormal gate movement, broken gate hardware, a gate off track, or repeated resistance during travel. If the alarm or harness is damaged, disconnected, or no longer working, the operator may not provide the expected audible warning during a fault condition. This part should be used only on supported operators and should never be bypassed to silence a safety-related alarm. Before replacing the alarm, inspect the gate hardware, rollers, track, wheels, and monitored safety devices for the condition that caused the fault.
Compatible With
This part is intended for the following LiftMaster applications when the model, suffix, and parts diagram confirm the same service part:
- LiftMaster RSL12U and RSL12ULMC slide gate operators; verify exact alarm harness and operator generation.
Common Replacement Reasons
- Alarm is physically damaged or missing.
- Alarm does not sound during a documented alarm condition.
- Harness is cut, corroded, or damaged inside the operator.
- Operator alarm wiring was damaged during service or enclosure work.
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Alarm With Wire Harness |
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| Part Number | K76-37298 |
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| Application | Audible alarm and harness replacement |
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| Compatible Operator Type | Residential/light commercial slide gate operators |
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| Compatible Models | RSL12U and RSL12ULMC references |
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| Safety Monitoring | Part of operator fault/alarm response system |
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| Notes | Do not bypass safety or alarm wiring to keep the gate running. |
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Also Known As / Related Part Numbers
The following numbers and search variations are commonly associated with this item or related service references. Verify exact replacement status before substituting any related number.
- K76-37298
- 76-37298
- K7637298
- RSL12U alarm harness
- RSL12ULMC alarm with harness
Technician Note
LiftMaster gate operator parts can vary by model generation, voltage, enclosure layout, and internal harness configuration. Match this part to the original component and the operator parts diagram before installation. Similar-looking reset switches, receptacles, limit parts, antennas, and alarm harnesses may not interchange across SL, RSL, RSW, CSW, LA, PPWR, or STAR1000 applications.
Before Ordering
- Confirm the manufacturer part number on the original part or service diagram.
- Check the operator model number and suffix on the equipment label.
- Compare mounting style, connector type, harness routing, voltage rating, and kit contents where applicable.
- For limit parts, confirm whether the operator needs a switch kit, passpoint kit, rack kit, or complete limit box assembly.
- For electrical parts, inspect the cause of failure before replacing the component.
Professional Advisory
Do not bypass monitored safety devices, alarms, interlocks, reset circuits, or factory protection features to keep a gate running. Disconnect power before servicing internal components. For high-voltage wiring, damaged control boxes, heavy slide gates, or operators that move unpredictably, have the system inspected by a qualified gate technician.
Important Ordering Warnings
- Do not rely on the product description alone when the operator has multiple generations or suffixes.
- Do not substitute a similar K76, K74, K23, K70, or K94 part number unless the parts diagram confirms the substitution.
- Limit-system repairs may require travel-limit setup and safety testing after installation.
- Receiver antenna repairs should also include a check of remote compatibility, receiver placement, and interference conditions.
Product Questions and Answers
Which models use the K76-37298 alarm with harness?
The strongest compatibility references list LiftMaster RSL12U and RSL12ULMC slide gate operators.
What does this alarm do?
It provides an audible warning during certain fault or obstruction-related conditions. It is part of the operator safety response and should not be bypassed.
Will replacing the alarm fix a gate that keeps alarming?
Not always. A gate that repeatedly alarms may have an obstruction, bad wheels, track issues, binding, incorrect limits, or safety-device problems. Fix the cause first.
Is this alarm used on RSW12 swing gate operators?
Do not assume RSW12 compatibility. This part is specifically referenced for RSL12U slide gate applications unless the parts diagram says otherwise.
Can the alarm be disconnected to stop the noise?
No. Do not bypass or disconnect safety-related alarm components to keep a gate operating. Diagnose the fault and repair the system properly.
