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MUDD PPB - Replacing the ControllerUpdated 3 hours ago

This guide provides step-by-step instructions for safely removing an old controller and installing a replacement unit on your electric motorized bike. You can follow along with the written procedure or the embedded video below.

CRITICAL WARNING: Always power cycle—Dissipate Controller Energy (DCE)—your electric motorized bike before disconnecting or reconnecting any electrical components or opening the controller bay. On dual-battery models, both batteries must be removed to perform a proper DCE. Step-by-step guidance is available in our Power Cycle (DCE) Guide.

Controller Replacement Video Guide

Required Tools & Materials

  • 3 mm hex wrench (Allen key)
  • 8 mm socket or open-end wrench
  • Phillips screwdriver
  • Flathead tool or small precision screwdriver (optional, for plug latches)
  • Smartphone (for clear photo documentation)
  • Replacement zip ties

Phase 1: Preparation & Controller Bay Access

  1. Power Down & Access the Bay:
    • Turn off the bike's electrical system, remove both batteries from the frame, and perform a full DCE power cycle to dissipate residual power.
    • Locate the controller bay cover plate on the left side of the bike frame.
    • Use a 3 mm hex wrench to unfasten and remove the cover plate screws.
    • Slide the cover down along the crank arm toward the pedal to move it clear of your workspace.
  2. Document Internal Layout:
    • Take a clear photo with your smartphone camera showing the layout of all internal wiring, connectors, and components before disconnecting anything. This serves as a critical reference when tucking wires back in later.
    • Carefully ease the components out of the controller bay to access all connection points.

Phase 2: Disconnecting the Old Controller

  1. Disconnect Battery Balancer & Molex Plugs:
    • Disconnect the yellow XT90 connectors originating from the battery balancer.
    • Disconnect the three white Molex plugsattached to the controller:
      • Tip: If a plug latch is stubborn, gently lift the locking hook using a small flathead screwdriver.
      • Caution: Carefully wiggle the connector body back and forth—do not pull directly on the wires, as fragile pins can pull out from the housing.
  2. Remove Main Power & Phase Wires:
    • Remove the clear plastic protective shield covering the terminal blocks on the controller.
    • Locate the main terminal screws securing the color-coded phase and power ring terminals (Red, Black, Blue, Yellow, Green).
    • Use an 8 mm socket or open-end wrench to break each terminal screw free.
    • Finish unthreading the screws using a screwdriver, then free all ring terminals from the old controller.
    • Set the old controller aside.

Phase 3: Installing the New Controller

  1. Connect Wiring to the New Controller:
    • Connect the three white Molex plugs into their corresponding color-matched ports on the new controller until fully seated and latched.
    • Reattach the terminal ring connectors (Red, Black, Blue, Yellow, Green) to their matching color-coded terminal posts on the new controller.
    • Tighten all terminal screws securely using a screwdriver and 8 mm wrench to ensure a solid electrical connection without stripping the threads.
    • Plug the yellow battery connectors back into the battery balancer.
  2. Secure Cover & Organize Wiring:
    • Reinstall the clear plastic protective cover over the new controller terminals.
    • Carefully guide and nestle all components and wiring harness bundles back into the controller bay cavity.
    • Secure loose wire bundles using replacement zip ties. Ensure wires are routed smoothly with no sharp bends, pinches, or crimps.

Phase 4: Final Reassembly & Testing

  1. Close Controller Bay & Test:
    • Slide the controller bay cover back up the crank arm and align it flush with the frame opening.
    • Secure the cover plate using your 3 mm hex wrench.
    • Reinstall both batteries into the bike frame and lock them securely.
    • Power on the display to verify proper system operation and functionality.

Need Further Assistance?

If you encounter issues during controller installation, experience error codes, or need technical guidance, please submit a ticket directly through our Contact Form.

IMPORTANT: Photos and videos are essential for resolving technical support tickets. Please attach clear photos of your controller bay wiring layout, terminal block connections, battery serial numbers, and display screen when submitting your ticket.
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