Lippert 387874 Power Stabilizer Extend/Retract Switch | IP66 Rocker

Replace a failed or missing extend/retract control on your Lippert electric stabilizer jack system with the Lippert Power Stabilizer Extend/Retract Switch (Part 387874) — an IP66-rated waterproof rocker switch with wiring harness included. Direct exact-replacement part. Available at The RV Surplus.

⭐ What's In The Box

• (1) Rocker-style extend/retract switch
• Wiring harness
• ⚠️ Installation hardware NOT included — reuse existing or source separately

⭐ Key Features

• IP66-rated waterproof — stands up to dust and heavy water spray, suitable for exterior mounting
• Simple rocker operation — press up to extend, press down to retract
• Exact replacement — plug-and-play with the included harness
• DIY-friendly install for anyone comfortable with basic 12V wiring

⭐ Part Number History

This switch supersedes two older Lippert part numbers. All three refer to functionally the same control:

• 387874 (current — this listing)
• Supersedes: 242409
• Supersedes: 344484

⭐ OEM Cross-References

Same switch ships into coaches under several brand-specific part numbers:

• Heartland: 0270491
• Jayco: 0237679
• Keystone RV: 490960
• Winnebago: 201431-01-000
• Back of switch label: AT141-121
  

If your dealer or parts list quoted any of these, this is the correct switch.

⚠️ Before Calling It a Switch Failure

If your stabilizers won't run, work through the basics first — switches are not usually the problem:

• Check battery voltage at the switch with a multimeter — a weak battery reads as a failing switch
• Inspect wiring connectors on both ends of the harness for corrosion or looseness
• Verify power is reaching the motor when the switch is pressed — if voltage leaves the switch but doesn't reach the motor, the fault is in the harness downstream
• Test the manual override drive on the stabilizer to confirm the jack itself is free before condemning the electrical side

⭐ Installation

• Disconnect 12V DC power to the stabilizer circuit before touching any wiring
• Remove the old switch and transfer the harness connections to the new one
• Mount in the existing switch cutout (hardware not included — reuse existing)
• Restore power and test extend/retract operation

1-Year Warranty with The RV Surplus

Specifications

• Brand: Lippert
• Part Number: 387874
• Also Known As: AT141-121
• Supersedes: 242409, 344484
• Type: Electric stabilizer extend/retract rocker switch
• Waterproof Rating: IP66
• Includes: Switch + wiring harness
• Not Included: Installation hardware
• UPC: 848150058126
• OEM Cross-References: Heartland 0270491, Jayco 0237679, Keystone RV 490960, Winnebago 201431-01-000
• Shipping Dimensions: 4" L × 3" W × 3" H
• Shipping Weight: 0.54 lbs
• Country of Origin: China
• Warranty: 1 year with The RV Surplus