SeaBis Marine System - Exclusively Prevents Electrolysis Corrosion.
LAND SeaBis System click: here

Extract from Process of Elimination Instructions:

#1 Installation:
1. Hard wire one SeaBis to each independent source of DC (alternator/battery) power. Normally 1 SeaBis only. For How Many SeaBis see below or click here.

Each independent alternator/battery bank is an individual source of the stray current that causes electrolysis corrosion. Prove them ALL electrolysis free.

Many causes are only visible when equipment is fully operational. One cause, missed during initial tests is more than enough to cause electrolysis. Indicate all causes by hard wiring SeaBis.

80% of vessels cleared of electrolysis, will experience a new cause within a year. Replaced or new equipment or a defect such as a VHF antenna that communicates perfectly but causes electrolysis. Starter motors and alternators generate carbon dust.  When Seabis System indicates the cause it is easily eliminated.

#3 Actual Equipment Repair:
Where  SeaBis  indicates a fault, it is easiest to correct non engine electrolysis first, so follow either of the following options: (engine faults are corrected last)

Method a) The simpler method applies to 90% of vessels.  Assuming SeaBis indicates a battery negative fault, the easiest method is to first disconnect the engine from the battery negative and connect the battery negative so the remainder of the vessel has battery negative.  Do not attempt to start the engine. 

Then progressively disconnect battery negatives at the common junction bar (usually a brass strip with holes and screws to common connect all battery negatives) until SeaBis indicates Normal – no electrolysis.

Then test each disconnected wire for electrolysis by momentarily reconnecting – one wire at a time.  If that wire causes electrolysis then disconnect and label.

When all wires are tested and those causing electrolysis disconnected, turn on the power and see what equipment does not operate.  Now you know the cause/s and can follow the instructions to correct it.  Reconnect the engine battery negative.

#4 Known causes and the repair:
5) Aerial/ Antenna including VHF and CB radio (non HF SSB). This may be a faulty antenna or one designed for land use. In either instance replace it: Antennas intended for land use do cause electrolysis and corrosion and so are best replaced by a marine design known as Ground Plane Independent (GDI), available from ZCG Scalar. ZCG Scalar will need details of transceiver frequency and power transmitted. Marine antennas have a non-metal base so no electrical connection to hull. Available from us at seabis@bigpond.com