Mercury MerCruiser Audio Warning Alarm Kit - 816492A6
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The Mercury MerCruiser Quicksilver 816492A6 is a genuine Mercury Marine OEM audio warning alarm kit used on select MerCruiser sterndrive and inboard engine packages. This alarm kit provides an audible warning signal when supported engine protection circuits detect an unsafe operating condition.
Depending on the engine package and wiring layout, the alarm system may be tied into monitored conditions such as low oil pressure, engine overheat, low drive lube level, or related MerCruiser warning circuits. The 816492A6 version should be matched by engine serial number, harness configuration, and factory wiring diagram before ordering.
Key Features
- Genuine Mercury Marine OEM alarm kit.
- Mercury/MerCruiser part number: 816492A6.
- Quicksilver-style catalog reference: 710-816492A6.
- Designed for select MerCruiser sterndrive and inboard warning systems.
- Provides an audible warning horn/buzzer signal for supported engine safety circuits.
- Used in compatible helm, dash, engine harness, and instrument wiring layouts.
- UPC reference: 745061318540.
- Important service part for failed, weak, intermittent, missing, or corroded warning buzzers.
- Related to the 816492 alarm kit family, but harness and terminal configuration must be verified before substitution.
Engine Compatibility
Common application context includes select gas-powered MerCruiser engine packages where the factory wiring diagram calls for 816492A6, including:
- Select MerCruiser 3.0L inline-4 applications where specified.
- Select MerCruiser 4.3L V6 applications where specified.
- Select MerCruiser 5.0L and 5.7L V8 applications where specified.
- Select MerCruiser 6.2L / 377 CID V8 applications where specified.
- Select MerCruiser 8.1L and 8.2L big-block applications where specified.
- Select Alpha and Bravo sterndrive/inboard installations using the matching warning-alarm circuit and connector style.
Use this kit only where the Mercury/MerCruiser parts diagram or wiring schematic specifically calls for 816492A6.
Serial Number Fitment Notice
Confirm fitment by MerCruiser engine serial number, harness plug style, instrument panel wiring, warning circuit layout, and engine service manual before ordering. The 816492A6 and 816492A15 kits are in the same alarm-kit family, but they may use different wiring arrangements, terminals, or production-specific connections. They should not be treated as interchangeable without serial-number confirmation.
When This Part Needs Replacement
Replace this alarm kit if the buzzer is silent during the proper key-on test, sounds weak, works intermittently, has corroded terminals, damaged wiring, cracked housing, or fails the diagnostic checks outlined for the engine. It should also be inspected when troubleshooting no-warning complaints, false alarms, alarm circuits that do not respond to verified sender inputs, or warning systems that have been bypassed or modified.
Installation Notes
Before replacing the alarm kit, verify power, ground, ignition feed, sender operation, harness continuity, and warning-circuit logic using the correct MerCruiser service manual. A failed oil-pressure switch, temperature sender, drive lube monitor, poor ground, corroded connector, or damaged helm harness can mimic a bad warning horn.
Install using the correct factory wiring connections. Do not bypass the alarm system or leave the boat in service with the audible warning disabled. After installation, perform the proper key-on and circuit test to confirm the buzzer sounds when the warning circuit is triggered.
Alternate/Superseded Part Numbers
- 816492A6 ā Mercury/MerCruiser OEM part number
- 710-816492A6 ā Quicksilver-style catalog reference
- 745061318540 ā UPC reference
- 816492A15 ā related alarm-kit family reference; verify by serial number and wiring diagram before substitution
Parts Desk Insight
The warning buzzer is a small component, but it is part of the engine protection system. A working alarm gives the operator an audible alert before overheating, low oil pressure, low drive lube, or another monitored fault causes serious damage. When comparing A6 and A15, the key check is not engine displacement alone ā it is the exact serial-number wiring diagram and connector configuration.
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Returns & warranty
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