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Stray current corrosion caused a stainless steel rudder post to disintegrate, leading to the loss of a rudder at sea.2:15 The failure originated inside the steering pedestal, where a poorly secured wiring harness chafed against the steering chain.1:35 This contact breached the insulation of a positive conductor, creating a fault path that traveled through the steering chain to the rudder quadrant and post.1:50 The current exited the rudder post into the water, completing the circuit through the propeller and shaft back to the battery negative.2:11 This process consumed the metal rapidly, leaving a white residue on the zincs while failing to consume the zincs themselves.1:31 Proper installation and support of electrical circuits prevent these faults from reaching the water.2:25 Bonding the rudder post to the battery negative would have provided a return path for the fault, potentially preventing the external corrosion.2:52 Even low-amperage faults of one to four amps can destroy metal fittings quickly.3:04

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