Replacing an older Blue Sea USB charger starts with the mounting opening, not just the two charging ports. The 1016 and 1045 fit a round dash-socket cutout, but the 1039 belongs in a rectangular Contura switch opening. The maximum combined charging output also differs. Use the original model number and connector label to identify the replacement.
Identify the mounting hole
1⅛-inch (approximately 28.6 mm) hole. The models share the mounting shape but have different rated USB charging outputs.
Approximately 0.83-inch wide × 1.45-inch high. Check the full Contura switch opening before replacing an existing fitting.
Cutout illustrations are simplified and not to scale. Confirm the manufacturer's mounting drawing and rear clearance before cutting or enlarging a panel.
Match the original 1016, 1039 or 1045
Manufacturer specifications describe the current production versions. Older stock may carry a different input-voltage marking, particularly for the 1016.
| Base MPN | Mounting style | Panel opening | Maximum total output | Supply range | Idle draw |
|---|---|---|---|---|---|
| 1016 | Round socket hole | 1⅛ in (28.6 mm) diameter | 5V, 2.1A total | Current model: 9–32V DC | 15 mA |
| 1039 | Rectangular Contura switch hole | 0.83 in W × 1.45 in H | 5V, 4.8A total | 9–32V DC | 1 mA |
| 1045 | Round socket hole | 1⅛ in (28.6 mm) diameter | 5V, 4.8A total | 9–32V DC | 1 mA |
Manufacturer current-version figures are 9–32V DC for all three chargers. The earlier 12V-only 1016 revision was rated for 9–16V DC. Inspect the actual product label before connecting a replacement to a 24V system.
Before fitting the replacement USB outlet
Check the original panel opening, 12V or 24V supply, existing fused circuit, wire termination and terminal clearance behind the panel. Inspect the dust cap and any signs of corrosion.
1016 is rated at 2.1A total across its two ports. The 1039 and 1045 are rated at 4.8A total and use intelligent device recognition. None of these ratings means each port supplies the full combined output, and these USB-A chargers are not USB-C Power Delivery units.
Blue Sea lists an IP45 rating with the protective cover closed. An open charging port should not be treated as watertight.
Find the Blue Sea outlet by exact MPN
Open the MPN to check current listing details and availability.
Blue Sea 1016
The 2.1A round-outlet model. Older examples may be marked for 12V only; check the marking on the exact unit.
Check item details and availability
Blue Sea 1039
Recognize the rectangular Contura housing, rather than the round socket used by the 1016 and 1045.
Check item details and availability
Blue Sea 1045
Round mounting shape like the 1016, but the higher 4.8A total rated output distinguishes this model.
Check item details and availabilityOther marine electrical connection references
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