Start/Stop Switch; Audio Warning System; Buzzer - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

Start/Stop Switch

Disconnect battery leads at battery before testing.

1. Disconnect battery leads.

2. Check for continuity between the terminals on the start switch with a continuity meter.

3. No continuity should exist.

4. Depress switch button and continuity should exist.

5. Check stop switch in the same manner.

6. If continuity exists when in the OPEN (not depressed) state, replace panel button.

1. Turn key to RUN position (engine off).

2. Buzzer should sound and then go off.

3. If horn does not sound:

90-861326--1 MARCH 1999

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For repair procedures on fuel injected engines, refer to Section 5.

a. Disconnect TAN/BLU wire at buzzer and touch it to a known good ground (–).

b. If horn sounds, problem is in TAN/BLUE wire back to engine or switches on engine.

Refer to "Discrete Input Circuit Checks" in SECTION 5E.

INSTRUMENTATION

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