If your bike does not have throttle power, there are a few things that could be going on. Please note, this is if you do not have throttle, but pedal assist is still working. The problem parts could be:
- Throttle
- Wiring Harness
- Controller
Again, we start at the source and work our way out. We know the battery turns on the bike, so that is not the issue. Next this brings us to the controller. As we do not have a way to test if that is the issue or not without swapping the whole thing, we move onto the next section, the wiring harness. We will need to check the continuity of the wiring harness to the throttle itself. First, unplug the throttle from the wiring harness. Here's a primer on how to remove and re-install the throttle on Tower eBikes:
Next, unplug the wiring harness from the controller. You will take your digital multimeter and set it to continuity (little triangle with waves coming from it). Next, take one probe end and put it into one of the holes on the wiring harness where it plugged into the throttle. Then use the other probe and start touching it to the opening on the other side of the wiring harness. You should eventually hear a beep at one of the connection ends. Repeat this for all of the openings on the wiring harness at the throttle end.
If you did not hear any beeps at any point of this process, then it is more than likely the wiring harness. If you get beeps at all of the connection ends, then we move onto the throttle.
Again, for the throttle, there are unfortunately not any tests we can run short of just plugging in a new functioning unit and seeing if it solves the problem. If it does not solve the problem, the culprit is more than likely the controller.
Everything DIY E-Bike Repairs
Homepage: eBike Repair Guide
eBike Repair Basics & Assembly
- eBike Specs and Walkthrough
- Tower eBike Serial Numbers
- Recommended Tools eBike Repairs at Home
- eBike Operation Guide
- Initial Build of a Tower eBike
- Tower eBike Torque Specs
- eBike Care and Maintenance
- Quick Reference eBike Repair Guide
eBike Brake System Service Guide
- eBike Hydraulic Brake System Introduction
- How to Adjust an eBike's Hydraulic Brakes
- How to True an eBike Rotor
- E-Bike Brake Rotor Install
- Brake Pad Install for E-Bikes
- How to Resurface eBike Brake Pads and Rotors
- How to Bleed Hydraulic Brakes on an eBike
eBike Drivetrain Service Guide
- How to Clean Your eBike Drivetrain
- Shifting Adjustment on an E-Bike
- Electric Bike Shifter Cable Install
- How to Install a New Chain on an eBike
- E-Bike Derailleur Installation
- Replace the Shifter on an E-Bike
- Replace an Electric Bike Cassette
- Crankset Install on an E-Bike
- E-Bike Derailleur Hanger Adjustment
- Installing Pedals on an Electric Bike
eBike Wheels & Tire Guide
- Flat Tire Repair on an Electric Bike
- New Tire Install on an Electric Bike
- Rear Wheel (with Hub Motor) Removal Guide
- How to True E-Bike Wheels
- Electric Bike Spoke Replacement
eBike Electric Repair Guide
- E-Bike Electrical System Overview
- Intro to Electrical Troubleshooting an eBike
- Methods of Electrical Troubleshooting an eBike
- Electric Bike Error Codes
- Electric Bike Battery Services
- Electric Bike Motor Issues
- E-Bike Will Not Power On
- Troubleshooting Pedal Assist on an E-Bike
- No Throttle Power eBike Troubleshooting
- E-Bike Does Not Pedal Assist or Throttle
- Intermittent Power Loss While Riding an eBike
Miscellaneous eBike Service Guide
