Many of the electrical tests in this manual call for the measurement of resistance (ohms) or voltage values. For safe and accurate tests of ignition, fuel injection, and emission control systems, the multi-meter, should be digital, with high (at least 10,000 ohms) input impedance. Some meters have automotive functions such as dwell and pulse width that are useful for troubleshooting ignition and fuel injection problems.
The Motronic (DME) fuel and ignition system, and other electronic systems, may be damaged by the high current draw of a test light with a normal incandescent bulb. Always use a high impedance digital multimeter or an LED test light for all electrical testing.
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