1. Disconnect the coil from the moped's electrical system.
2. Set multimeter to Ohms (Ω) setting.
3. Touch one probe to the coil's primary winding terminal and the other probe to the coil's secondary winding terminal.
- The multimeter should read a low resistance value (typically between 0.1 and 1 Ohm) for the primary winding and a high resistance value (typically between 500 and 1000 Ohms) for the secondary winding.
- If the multimeter reads "OL" (open circuit) for either winding, the coil is faulty and needs to be replaced.
- If the multimeter reads a low resistance value for the secondary winding, the coil is shorted and needs to be replaced.
You can also test the coil by using a spark plug. Here's how to do it:
1. Remove the spark plug from the cylinder head and reconnect it to the coil wire.
2. Place the threaded end of the spark plug against the cylinder head or other grounded metal surface.
3. Kick-start or turn on the moped's engine.
- If the coil is working properly, you should see a spark jump across the gap between the spark plug's electrodes.
- If you do not see a spark, the coil is faulty and needs to be replaced.
