Using an Ohm Meter
An ohm meter can be simply that, or it can be part of another, more common, electrical testing device called a multi-meter. AN ohm meter uses a small electrical current to check the continuity of a circuit, also on different settings it can also tell how much resistance is in a circuit.
Use an ohm meter to check continuity in motors, cable or fuses. If a circuit has a break in continuity, it is called “open” (it has break in it). In t he image below, the ohm meter settings are selected at the bottom of the dial, indicated by the Greek letter omega Ω.
1. Set your ohm meter to the lowest scale on the resistance setting. Usually it will have Ω (Greek letter omega) for resistance.
2. When testing a motor, touch the red ohm meter cable to the red motor cable, and the black to the black.
3. When testing a fuse, touch the end of each ohm meter cable to the opposite ends of the fuse (see image below).
4. When testing a straight – through controller cable (CC, image below), touch the red ohm meter cable to pin 1, the black to pin 1 at the other end, then pin 2 to pin 2, etc.
5. The ohm meter LCD displays reading.
6. A reading between 0 and 2 indicates continuity – the circuit is good.
7. If you read infinity (∞) or OL (open line) the circuit is bad.