Riding a bicycle is good exercise and an environmentally friendly mode of transportation. Whatever your reason for riding a bike, you must always think of safety first. Wear a helmet and pads, know the rules of the road and be sure your bicycle is equipped with reflectors and lights so that you can see and be seen at all times. Maintaining your bike is of the utmost importance as well. Grease the chain, change the break shoes and tires as necessary, and know how to repair your bicycle light so you can ride comfortably and safely day or night.
Have an assistant hold the handle bars of the bike with one hand to keep it steady. Have them use their other hand to lift the seat to raise the rear wheel of the bicycle off of the ground.
Use your tester to check for electrical flow at the leads on the back of the light assembly in the front of the bike. Be sure your assistants are holding the bicycle steady and keeping the rear wheel spinning throughout the testing process.