How to stop marine stray current and rust CAUSE in 3 steps, permanently. Guarantee. No thru hull, extra anodes or moving parts.

Marine electrolysis is the major CAUSE of marine corrosion. SeaBis Master System stops the CAUSE. Even AC or shore power!
Stray current, marine electrolysis, corrosion eliminated

Corrosion CAUSE corrected, permanently

How to stop marine stray current corrosion in 3 steps.


Marine stray current corrosion is caused by fault/s on your boat. SeaBis measures that stray current with extreme accuracy.  To eliminate the cause follow  How To Stop Corrosion, supplied with SeaBis Master System.

Installation is easy:  3 wires, brown to battery positive,  blue to battery negative, green/yellow current sense to metal hull or engine body.  Indication by a traffic light system, support included.

Marine stray current explanation

Assuming you are sitting at your desk and the light is on. Now leave the light on. So you do not burn your hands, use a rag to remove the light. Voltage via the switch is still applied.  Now no current flows through the light so it ceases to deteriorate. Measuring voltage will show no change.  Measuring current will immediately show current is zero. SeaBis is the only system to eliminate the CAUSE of corrosion, World-wide. Now stop marine stray current with How To Stop Corrosion using SeaBis indications to correct the CAUSE/s. Or contact us.

Use SeaBis System to stop marine stray current

Connect SeaBis brown to battery positive, blue to battery negative.  Then green / yellow current sense to metal hull or engine body.  Make good connections with no paint, oil or grease. SeaBis indicates the ability of marine stray current to create corrosion. Now use How to Prevent Corrosion to stop marine stray current and complete correction of CAUSE.

Marine corrosion caused by stray current electrolysis eliminated
To identify the CAUSE, switch off circuits until SeaBis indicates Normal

How identify the CAUSE

Now switch off circuits until SeaBis indicates Normal (green).  The last equipment switched off was the cause.  Now it has no power so is easily identified. How To Stop Corrosion contains full instructions.  Support is included.

How to repair stray current CAUSE

SeaBis Master includes How To Stop Corrosion.  It details process, typical causes and their repair.  Free support value AU$80 or 1/2 hour on line, is included.

Keep SeaBis connected-stop ALL stray current

Corrosion is generated by stray current caused by water in navigation lights or other equipment, failed antenna, new equipment and carbon build up.  Now you are immediately warned you can stop  corrosion before it attacks.

Engines do not have to cause stray current

Recreational and some commercial engines are used less than 200 hours per year. A correct switch or solenoid can prevent 97% of the CAUSE of corrosion. The type of switch or solenoid and installation depends of your engine and SeaBis results.  Contact us with SeaBis results and we will advise type and installation.  So installing a switch or modified solenoid will stop stray current – corrosion while engine is off.  The engine and solenoid are on less than 3 % of the time so resulting corrosion will be less than 3%.  Contact us with SeaBis indications and boat description before using this procedure.  If engine ON hours are greater than  200 hours per year then engine use is commercial so contact us with SeaBis indications.

Ongoing support

There will be times when stray current causes an other than Normal (green) and corrosion is ongoing.  Contact us and we will assist you. Updates to How To Prevent Corrosion will be emailed to you.

We will support you. Contact us.

Link to Conquer corrosion in 3 steps

Proof we are correct Wikipedia

To fix, stop and prevent corrosion and we must:

1. Understand the CAUSE – usually our vessel 

2. Identify the cause – by switching or unplugging circuits

3. Eliminate the cause, stray current, using SeaBis.


The current that CAUSES marine corrosion can be very low – 0.00001 amp. 

So why use a multi meter?

Multimeter limitations:

A multi-meter measures current in series, is insensitive by at least a 1,000 times and has been lethal when used on amps. Multi-meters on amps have caused battery acid to ignite and explode resulting in a very painful death.



A multi-meter incinerating while in my hands caused me to develop SeaBis.


SeaBis is safe and accurate:

We measure current in parallel with no effect on circuit being measured. So we are safe and accurate.


SeaBis System conquers electrolysis:

SeaBis Master System indicates the degree of aggressive and corrosive action of the stray current that causes corrosion so a decision as to urgency of repair can be made.

Explanation - the original cause of corrosion

The Cause:

The cause of corrosive current is the battery “0” volts terminal. In Kelvin Absolute Law terms (see Wikipedia) is actually at minus 12 volts for a 12 volt battery (24 for 24 volt battery). The metal contains electrons which are negatively charged. So the two negatives repel each other causing corrosion by dissolving your metal into particles. The Earth is at +1.2 volts so attracts those particles. So your metal corrodes to the Earth.

The Solution:

The solution is to use SeaBis Master System to eliminate the cause.

SeaBis explanation

How to stop stray current corrosion, explanation:

Assuming the lamp above your head is on. Now, leaving the switch on, using a rag, remove the lamp. The lamp goes out and current through the lamp is zero. So its element will no longer degrade. The element is your hull or engine.

Now there is no corrosion. The switch is still on so voltage has not changed. So there is no point in measuring voltage. SeaBis measures current with extreme accuracy.

Half cell meters, through hull meters, multi meters or probes measure voltage so cannot tell you the truth. The SeaBis Master System measures current!  That is why it eliminates corrosion.


Alternative to SeaBis System:

I have a laboratory instrument meter and current clamp combination that is accurate to SeaBis specifications. It cost me AUD2,600 at trade price.

Galvanic corrosion

When dissimilar metals approach, in a conductor such as water, current flows between them. That current is very minor compared to marine corrosion current.

That galvanic current is easily eliminated by anodes. However stray current corrosion must be eliminated first as it often is one million times more corrosive.

Guarantee and Warranty


 We expect your SeaBis Master System, where it is permanently installed, will last for 20 years and will guarantee it, manufacturers faults only, for 8 years commencing on receipt full payment.

 If you get a problem after 8 years come back to us and we will see what we can do.  If you have difficulty contact us.

 Should the security seal on the back of SeaBis be tampered then all guarantee and warranty are void.

 Should a manufacturing defect occur, we will, at our discretion, repair, replace, or refund the money paid to Podean Electronic Industries Pty. Ltd. trading as SeaBis for the SeaBis unit.  Providing How To Stop Corrosion has been complied with and we have authorized the claim and the return of the SeaBis System. Guarantee includes manufacturers fault/s only. Shipping is World-wide so is the responsibility of the Owner. Many have more than 8 years years in use so we require proof of purchase.

 Do not ignore the AC Only light. When it flashes your equipment is at risk.


Comply with How To Stop Corrosion.  Then your warranty will be effective.  We warranty SeaBis Master System with How To Stop Corrosion will eliminate ALL CAUSES of corrosion caused by stray current – marine electrolysis. 

1: ALL batteries and DC power, without SeaBis System, create the stray current that causes corrosion so permanently monitor them all. 10 cumulative days, without SeaBis, can allow corrosion you can, without your knowledge.

 2: Batteries may be switched in parallel so one SeaBis monitors them all.

 3: Time away from your vessel can be excluded as we will take steps to ensure there is no corrosion while you are absent – see How To Stop Corrosion.

 4: Equipment you cannot turn off is treated separately. Thus absolutely minimizing the risk. Contact us.

 As always, we will support you.


The SeaBis box proved very useful in tracking down multiple stray current problems aboard our boat. The leading cause was old household wire originally installed by Beneteau and new electronics that had not been earthed correctly. The service from SeaBis was excellent with prompt replies to my queries. I did really appreciate your help. Thanks again for your help, its been A1 service.

Andrew Deeley / SV Utopia II

Marine electrolysis that causes marine corrosion eliminated

Hi Glen, Thanks for your help earlier today. I’ve easily isolated the offending components… spreader lights depth sounder …and the starter motor. I guess the latter is due to carbon build up as it is meant to be a separate earth unit. Anyhow, back on track now. Cheers, Mike

Mike Brady

Marine electrolysis that causes marine corrosion eliminated

My wife and I are currently circumnavigating aboard our 45 ft. steel yacht. I purchased a SeaBis System after borrowing a friend’s SeaBis and discovering that I, too, had stray current – a flashing red critical light is hard to ignore. This was after the boat had been tested and cleared by the test bulb method. I have no electrical skills but, by following the system, I was able to detect and eliminate the four causes of stray current – a non-isolated genset, a VHF aerial not insulated from the mast, a fuel tank gauge not insulated from the SS day tank, and the connection between a non 12v computer and the SSB radio – to achieve a very satisfying green normal light.

Furthermore, the SeaBis has identified AC leakage from worn brushes in 12v fans and, most recently, a path between the brushes and case on my Balmar alternator, which blew the SeaBis fuse before causing any damage. I consider the SeaBis to be a vital element in diagnosing my yacht’s electrical health. I would also add that Glen has been a great guy to deal with, standing behind his product and providing a wealth of diagnostic advice.

You may use my testimonial with verification.

Mark and Heather Domney

Marine electrolysis that causes marine corrosion eliminated

Six years ago I purchased a Dutch barge in Amsterdam, shipped it to the UK and spent four years restoring it to a fully functioning residential boat in my spare time. During this process I learnt much about the ways of vessels which has added to my automobile knowledge. One of the things I learnt was that corrosion was destroying my hull which lead into an investigation, this in turn lead me to the SeaBis. I completed How To Stop Corrosion and time has proven the cause is removed. No more stray current corrosion.

Paul Michelmore

Marine electrolysis that causes marine corrosion eliminated

Well Glen your SeaBis system fixed the cause. No problems in 5 months. It was a deck generator and CB radio.

John Singleton

Marine electrolysis that causes marine corrosion eliminated

We purchased a steel cruiser 8 years ago and had problems not long after purchase with corrosion on the decks. When the boat was slipped we had evidence of metal corrosion which I think is caused by electrolysis, on the hull as well. When the boat was returned to the water I had a marine electrician check out the boat and he said that our boat was OK and the corrosion was caused by the boat next to us in the marina.

We then believed that was the cause, we tried to get the marina to do something about it but they did not want to know. When the boat was slipped 18 months later the corrosion was that bad we had to sand blast back to bare metal and repaint including the decks. We moved the boat out of marina and put it on a swing mooring, when the boat was slipped again it was evident again. I looked on the web and found the SeaBis site and purchased a unit since then the decks have stopped showing signs of accelerated corrosion. Although we have yet to slip the boat again to check the hull I am confident that the SeaBis unit is performing, as the decks are looking great.

Michael Cuthbert

 Two Volvo engines with a carbon fibre mast and extensive advanced corrosion to engines. One has previously been replaced. The Owner and Peter traced the cause to a separate power supply in the instrumentation. Fitted an isolating diode and isolating switches to both engines. Problem fixed.

Peter – Qualified and experienced Marine Electrician