Mercury MerCruiser Quicksilver Panel Assembly 55642A1

Mercury Quicksilver Panel Assembly Part No. 55642A1

This is a genuine OEM Mercury Marine / Quicksilver panel assembly used on classic MerCruiser sterndrive and outboard electrical rigging systems. The panel serves as the central mounting point for engine control switches and electrical connections at the helm housing ignition, trim/tilt, and instrumentation wiring in a single organized assembly. This part number has been superseded by 55642A17, which is the current production replacement. If 55642A17 is available, it is the preferred order; 55642A1 remains the correct reference for diagram identification and cross-referencing.

Part Details

• Part Number: 55642A1
• Brand: Mercury Marine / Quicksilver
• Official Product Type: Panel Assembly / Helm Control Panel
• Superseded By: 55642A17 (current production replacement)
• System: Electrical / Engine Control
• Condition: New OEM

Compatible Applications

• MerCruiser 120 and 140 engines
• MerCruiser 165 engines
• MerCruiser 470 and 485 engines
• MerCruiser 898, 228, and 260 engines
• TR and TRS sterndrive systems (approximately 19771993)
• Mercury outboard electrical rigging systems (1985 and earlier)

Always verify compatibility using the engine serial number and parts diagram before ordering. Control panel specifications vary by engine model, rigging configuration, and production year.

Supersession Note

This part (55642A1) has been superseded by 55642A17. The A17 revision is the current production panel assembly and is the preferred replacement. If you are ordering for a restoration or need to match the original part number exactly, confirm with the parts diagram whether the A17 revision is a direct drop-in for your application.

Installation Notes

• Disconnect battery power before removing or installing any panel assembly
• Label or photograph all wiring connections before disassembly to ensure correct reinstallation
• Verify switch and connector positions match the original panel layout before finalizing installation
• Follow the Mercury service manual wiring diagram for your engine model and serial number range
• Test all functions (ignition, trim, instrumentation) before returning the vessel to service

Service Interval

Inspect the panel assembly during annual electrical system service. Replace if switches are corroded, contacts are pitted, wiring insulation is cracked, or the panel housing is damaged. Corrosion at switch contacts is a common cause of intermittent ignition and trim faults on older MerCruiser systems.

Parts Desk Insights

Best use case: Restoration of classic MerCruiser TR/TRS sterndrive systems and older engine packages where the original panel has corroded switches, damaged wiring, or a broken housing. This is also the correct reference part number for cross-checking the superseding A17 revision against your specific engines diagram.

Common mistakes: Ordering the A1 revision when the A17 is available and a direct fit always check current availability of the superseding part first. Also confirm the panel configuration matches your rigging setup: Mercury used several panel variants across the TR/TRS era that differ in switch count and connector layout, and they are not always interchangeable even within the same engine family.

Related Parts

• Mercury MerCruiser Quicksilver Switch Assembly 54211T
• Mercury MerCruiser Quicksilver Circuit Breaker 11178A01