Mighty Mule FM502 On Off Power Switch Replacement
This Mighty Mule on/off power switch is the replacement switch used to control power at the operator control box on compatible FM502-style systems. The switch is a small part, but it is important for safe service and daily operation because it allows the low-voltage gate control system to be turned off at the box. Customers usually look for this part when the switch lever is broken, water has corroded the terminals, the operator only powers up when the switch is held in a certain position, or the loaded control box is being refreshed with matching service parts.
A bad switch can create intermittent power symptoms, but similar symptoms can also come from a weak battery, damaged battery harness, failed transformer, loose spade terminal, or damaged control board. This item should be matched to the original FM502 control box switch style before replacement.
Compatible With
This switch is tied most directly to the following applications and related service assemblies:
- Mighty Mule FM502 operator control box switch replacement
- Mighty Mule FM502 R4690 loaded control box service reference
- Select Mighty Mule FM500 / FM502 control box assemblies when the original switch style matches
- Related R4690 loaded control box assemblies that include an on/off switch
- Not a universal switch for every Mighty Mule, GTO, or Linear Pro control box
Features & Specifications
| Manufacturer | Linear / Mighty Mule / GTO |
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| Product Type | On/off power switch |
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| Part Number | Switch |
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| Related Listed Part Number | LIN-Switch |
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| Application | Replacement low-voltage power switch for compatible control box service |
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| Compatible Operator Type | Select Mighty Mule swing gate operator control boxes |
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| Voltage | Low-voltage control circuit application; match original system |
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| Notes | Match terminal layout and switch style before replacement |
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Also Known As / Related Part Numbers
Common related names and search references include:
- Switch
- LIN-Switch
- Mighty Mule On Off Power Switch
- Mighty Mule On/Off Power Switch
- FM502 power switch
- FM502 on off switch
- R4690 loaded control box switch
- Control box power switch
Technician Note
When diagnosing a dead FM502-style operator, check battery voltage, charging transformer output, harness condition, and board indicators before assuming the on/off switch is the only failed part.
Before Ordering
- Confirm the switch style and terminal layout match the original part.
- Disconnect power and battery before servicing the control box.
- Inspect terminals for corrosion or loose push-on connectors.
- Check for water intrusion inside the control box.
- If the board or wiring is burned, have a qualified technician inspect the operator.
Important Ordering Warnings
This part is not a universal high-voltage disconnect. Do not use it as a substitute for proper electrical service disconnects or for unsafe wiring repairs.
Professional Advisory
Gate opener service can involve stored gate force, moving arms, batteries, and low-voltage control wiring. If the operator is moving unexpectedly, has damaged wiring, or has missing required safety devices, have the system inspected by a qualified gate technician before returning it to service.
Product-Specific Q&A
Is this switch listed for the FM502 operator?
Yes. This on/off power switch is listed as a Mighty Mule FM502 replacement part.
Can a bad power switch make the gate seem completely dead?
It can, especially if the terminals are corroded or the switch is physically broken, but battery, transformer, harness, and control board issues can cause similar symptoms.
Is this part included in a loaded control box?
R4690 loaded control boxes are commonly listed with an on/off switch included as part of the assembled control box package.
Can I use this switch on every Mighty Mule opener?
No. Match the original switch style and control box configuration before using it on other Mighty Mule or GTO models.
Should high-voltage wiring be changed when replacing this switch?
No. This is control box service. Unsafe electrical wiring or high-voltage issues should be handled by a qualified technician.
