Electric bicycles are a great, eco-friendly way of getting around for short distances, but you do need to remember to charge them regularly. Your charger is a very important piece of equipment and you're totally reliant on it to keep your bike functioning. Fortunately, there's very little that can wrong with a charger: it's similar to a transformer and doesn't contain moving parts, just coils of wires. If you find your bicycle battery hasn't charged properly, chances are the plug wiring or the fuses are malfunctioning. Making repairs to your electric bicycle charger is a straightforward process.
Check the plug wiring and the fuse in the plug. If the fuse is blown or a wire is disconnected, you have likely found the explanation for why your charger isn't charging your electric bicycle battery.
Remove the screw holding the plug cover in place so you can access the fuse and the wiring. Check that the three wires are connected and secure. Tighten the terminal screws. Replace the fuse, and ensure the replacement has the same amperes as the one you removed.
Replace the plug cover and tighten using the screw and screwdriver. Insert the plug in the wall socket. Turn on the charger. If the "on" light illuminates you know there's power getting to your charger, but you need to ensure the charger is producing electricity to charge your bicycle battery.
Place the metal tip on the end of the red wire from a voltmeter onto the metal clamp on the end of the red cable from the battery charger. Do the same using the black wire from the voltmeter and the black cable from the battery charger. Check the reading on the meter. If it reads the correct voltage -- usually 6 or 12 volts -- you've repaired your electric bicycle charger. If there's no reading, replace the fuse on the charger.
Turn off the charger. Locate the small fuse on the front or back panel of the charger. Pull the fuse from the fuse holder using your fingers. Check the fuse rating and replace it using a new fuse that has the same rating.
Turn on your charger. Repeat the voltage test described in Step 4. If you get a reading, you've repaired your charger. If you don't get a reading, you have an internal charger problem. Electric bicycle chargers don't contain serviceable parts, so you will need to get it checked out by an electrician.
