Volvo Penta Toggle Switch 850710

Volvo Penta 850710 is a genuine toggle switch used on a wide range of classic Volvo Penta marine engine and sterndrive applications. Volvo Penta’s official parts shop lists 850710 as toggle switch, and current OEM parts retailers continue to catalog it as an active genuine part number.

Key Features

• Genuine Volvo Penta part number 850710.
• Described in current parts listings as a toggle switch / switch.
• Common dealer weight reference: 0.016 kg.
• Current OEM retail listings show this as a stocked service part for older Volvo Penta electrical/control applications.

Engine Compatibility
Current application listings associate Volvo Penta 850710 with a broad range of classic Volvo Penta models, including 100S, 110S, 230A, 230B, 250A, 250B, 280B, 290DP, AQ115A/B, AQ120B, AQ125A/B, AQ130A/B/C/D, AQ131A/D, AQ140A, AQ145A, AQ165A, AQ170A/B/C, AQ175A, AQ190A, AQ200B/C/D/F, AQ225B/C/D/E, AQ231B, AQ240A, AQ255A/B, AQ260A/B, AQ271B/D, AQ290A, AQAD30A, AQAD40A/B, AQD21A/B, B20, B230, B230E, B230F, B230FB, B230FX, BB115A/B/C, BB165A, BB170A/B/C, MB20A/B/C, MD21A, and MD21B. Confirm exact fitment by serial number before ordering.

Serial Number Fitment Notice
Volvo Penta fitment can vary by control setup, dash arrangement, engine version, and production break. Confirm part number 850710 against your exact engine or drive serial number before ordering. Volvo Penta’s parts shop specifically directs owners to identify the engine, shield, or drive when selecting the correct genuine part.

When This Part Needs Replacement
Replace this toggle switch when the original switch becomes intermittent, fails to hold position correctly, shows corrosion at the terminals, has a damaged lever, or no longer operates the intended electrical function reliably. It is also worth replacing when restoring older helm panels or troubleshooting aged electrical controls on classic Volvo Penta installations.

Installation Notes
Match the switch by exact part number and serial-number-based parts lookup before installation. Inspect the panel opening, terminal condition, and connected wiring before fitting the new switch, and follow the correct Volvo Penta wiring diagram or service information for the specific application. Genuine Volvo Penta parts are designed to meet Volvo Penta’s specifications for dependable operation in marine environments.

Alternate/Superseded Part Numbers
The current sources reviewed identify 850710 as the active Volvo Penta genuine part number. I did not see a reliable official supersession reference in the sources reviewed, so the cleanest ordering reference is Volvo Penta 850710.

Parts Desk Insight
Older Volvo Penta switches often fit a surprisingly wide range of AQ and sterndrive-era panels, which makes serial-number verification especially important. A switch can look correct and still differ in mounting style or circuit function, so ordering by exact Volvo Penta part number is the safest way to avoid repeat electrical troubleshooting on older boats. This part is still actively retailed as a genuine service item, which is a good sign for ongoing support of legacy applications.

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