NIPPONDENSO Electronic Ignition System: Testing: Notes

CAUTION: Be sure all connections are correct, as reverse battery polarity within the system will damage the ignition (ignition control unit). Do not disconnect battery while engine is running or transistors may be damaged. Do not allow water to enter ignitor. If a tachometer is connected to system, connect tachometer positive lead to coil negative terminal.

CAUTION: Be especially careful when checking Toyota systems, as a variety of ignition coil, ignitor, and resistor combinations are used. Connectors and wire colors also vary from model to model. Illustrations are for typical systems only.