What is the troubleshooting method for low-voltage circuit faults in the ignition system?

[AnastasiaLee]

The troubleshooting method for low-voltage circuit faults in the ignition system is as follows: 1. If the horn sounds and the headlights turn on, use a screwdriver or wire to test for spark at the negative terminal of the ignition coil. If there is no spark, the fault lies in an open circuit between the ignition coil's low-voltage terminal and the ammeter. 2. If the horn does not sound and the headlights do not turn on, use a wire to test for spark at the starter terminal. If there is spark, the fault is an open circuit in the wiring between the starter terminal and the ammeter. 3. Use a screwdriver to test for spark at the negative terminal of the ignition coil. If there is spark, then test for spark between the movable contact arm of the distributor and the base plate. If there is spark, the fault lies in the contacts.