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Home >> Mercedes Benz >> 1973 >> 220 _NA_, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MERCEDES-BENZ 220 Engine Modification >> Testing >> RPM Switch

RPM Switch

CAUTION: Use only voltmeter for checking RPM switch. Use of a test light might damage RPM switch.

Back out 2 prong plug on switch-over valve and connect voltmeter. Start engine and increase speed. Voltmeter should read 13 volts up to about 2000 and zero volts above 2000 RPM. If test fails, repeat test with new relay box and/or new RPM switch.

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