• 50 cent Tester

    Tutorial Written By Fellow Member Jackpilot

    here is a small gizmo that can tell you when a circuit is open or closed.
    Actually, the best is a $20 multimeter but let's start with that.

    You need a battery and a bulb , any battery, any bulb as long as the voltage of the battery is not higher than the voltage of the bulb, polarity is not an issue.
    Alligator clips on A and B are a good idea.
    Test your contacts with A on one B on the other, if the bulb lights up circuit is closed, and vice versa.