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A 12-volt cigarette lighter socket on an Oceanus 45 fails to power a replacement double USB outlet, with voltage dropping from 12 volts to 3 volts immediately upon connecting a device.0:48 This voltage drop under load indicates high resistance in the circuit, typically caused by a poor electrical connection or undersized wiring.2:26 Jeff Cote recommends inspecting all connection points between the USB outlet and the battery bank, starting at the outlet itself.2:34 If connections are secure, the wire gauge is likely insufficient to handle the current draw.2:49 While many factory-installed outlets use 18-gauge wire, upgrading to 14-gauge or even 10-gauge wire for high-load applications minimizes voltage drop and ensures consistent power delivery.2:26 Testing voltage at the battery versus at the appliance under load reveals the true health of the circuit, as a static reading without a load often masks significant resistance issues.1:02

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