Blue Sea Systems M-Series Battery Switch Spare Locking Key, Black

Overview

The Blue Sea Systems 7903200 is a spare locking key for compatible M-Series battery switches in black. It is used when the original key has been lost or damaged and you want to restore the keyed function of the switch without replacing the full switch body.

This replacement is meant for Blue Sea Systems M-Series battery switch applications, including keyed single-circuit ON-OFF models in the same family. For boats that use a keyed battery disconnect to control access during storage, service, or layup, this small part can save replacing hardware that is otherwise still working.

Key features

• Spare locking key for Blue Sea Systems M-Series battery switches
• Black finish that matches black keyed M-Series switch configurations
• Useful as a direct replacement when the original locking key is missing or damaged
• Lets you keep the existing switch in service when only the key needs to be replaced

Compatibility and fit

This part is for M-Series battery switch setups that use the locking-key style. It is a good match when the switch itself is still in place and functioning, but the keyed insert has been lost, broken, or needs to be kept as a spare on board.

Before ordering, match the switch family and keyed style already installed on the boat. That matters most on refits and service work where Blue Sea Systems battery switches may be mounted near the battery bank, inside a locker, or behind a panel and different switch series can look similar at a glance.

Use on board

This replacement makes sense for owners, yards, and service techs who keep spare electrical parts on hand for routine maintenance. It is especially useful on boats where the battery switch is part of the normal shutdown routine and the keyed function still needs to be available after the original key goes missing.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.