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Pathfinder Electrolysis

Old 04-10-2020, 04:18 PM
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Default Pathfinder Electrolysis

I purchased a new 2020 Pathfinder 2600 TRS last December and since that time I have suffered an advanced amount of electrolysis on my swim platform bracket. Any advice to remedy this issue and stop any further damage?
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Old 04-10-2020, 06:16 PM
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Some information would help. Does the boat stay in the water or out of the water? Is it plugged into any shore power? That’s for starters.
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Old 04-11-2020, 05:48 AM
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The boat had been in the water for the first 3 weeks until my boat lift was installed. It had been on and off shore power between charging. The electrolysis was aggressive within the first couple of weeks
Old 04-11-2020, 05:53 AM
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That does not sound like a boat issue. That sounds like a stray current in your canal or marina issue. What do your zincs look like?
Old 04-11-2020, 05:58 AM
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Old 04-11-2020, 06:10 AM
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Electrolysis issues in a bay boat are likely to come from two areas. Electric current around your dock or wiring issues with your trolling motor.
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Old 04-11-2020, 06:34 AM
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Zincs look normal for this period of time
Old 04-11-2020, 07:21 AM
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have you checked for stray currents on the boat, in the water, on the dock?
Old 05-22-2020, 08:04 AM
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I just purchased a 2020 2600 TRS and I have had the exact same problem with the swim platform bracket. We are testing the water at the marina to see if that is the culprit but I think there must be something else going on. My boat was also in the water for approximately 3 weeks and we noticed the issue as soon as we took it in for a 20 hour service. Any updates on your end?
Old 05-22-2020, 09:19 AM
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Your post doesn't say where you are. Find a good marine electrician or a marine surveyor who has training in corrosion surveys. Something is wrong with some electrical system - your boat's or the dock's. It is not a simple problem to diagnose, much less to diagnose remotely.
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Old 05-22-2020, 07:12 PM
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we have a marine surveyor coming next week. The corrosion problem was also impacting one of the trim tabs. The dealer put zinc on the trim tabs to help prevent more problems. If the survey comes back negative, what else could be pulling current into the water at the rear of the boat?

Originally Posted by 74lbSteve View Post
Your post doesn't say where you are. Find a good marine electrician or a marine surveyor who has training in corrosion surveys. Something is wrong with some electrical system - your boat's or the dock's. It is not a simple problem to diagnose, much less to diagnose remotely.
Old 05-22-2020, 07:40 PM
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Are you equipped with a 36 volt trolling motor by chance with a perko/jumpstart switch?
Old 05-23-2020, 07:44 AM
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We do not have a trolling motor installed but the boat is wired for one. Someone also asked where we are located. Currently the boat is in the outer banks NC. Thanks for all the help and ideas.
Old 05-23-2020, 08:21 AM
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If you are putting in a aluminum boat lift, make sure you have good zincs on it and watch them closely. your boat corrosion issue may go away but the lift may have issues, If so that likely means that a nearby dock/boat is likely the cause. If the lift is OK. Then I would guess your boat is the cause and others are not happy with you.

Good luck.
Old 05-23-2020, 09:06 AM
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As others have said, marinas and canals with docks are often the source of stray voltage.

I had a similar problem with a brand new 2011 Shearwater years ago. BTW, the boat was stored in my garage. Never was wet slipped. As it turned out the master accessory wiring harness had a hot (but unused) Deutsch connector loose in the bilge under the leaning post. I guess that was for a livewell option v LP and should have been killed or secured out of the bilge.

Get a flashlight and inspect all of the bilge wiring very closely. Good luck to the OP.



Background, for those interested: I noticed after 10 hrs of use that my zincs were very powdery - never seen that in 30+ yrs of boating on a new boat. Had it tested for stray voltage. When the boat was wet, for example, there was 3.6v on the stainless rub rail insert while sitting on the trailer. Even the hand control MG TM, would still run very slowly, even with the TM power toggle switch off. Yep. Just crazy stuff. Bob A at SW did absolutely nothing to help other than to say ‘it shouldn’t be doing that’. Local SW dealer at the time was Gulf Coast Marine and they actually said ‘be happy, your anodes are working’. I knew that was a BS answer, so I took it to LMC in Houston for a post break-in oil change on the 250 SHO and asked them to take a look at the stray voltage mystery. The SW rep did eventually come out to see for himself at LMC and said he had never seen that before and agreed that the problem was ‘fixed’, by killing that unused wet connection. There was no stray voltage after LMC resolved it. SW did zero to assist with the costs incurred.

Old 05-23-2020, 09:15 AM
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I have a 2018 2500 Hybrid Pathfinder and had a similar experience. The boat was in the water for about 4 days and plugged into shore power for charging the batteries. The bracket on swim platform was destroyed after 4 days. I replaced it and haven't left it in the water since. I'm beginning to wonder if there's not a wiring issue with these Pathfinders. Nevertheless, the boat is awesome. I love it.
Old 05-23-2020, 09:23 AM
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Replace any bilge pump float switches and carefully check all associated wiring.
Old 05-23-2020, 11:08 AM
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Keep in mind that zincs (anodes) will protect more noble metals in situations of galvanic corrosion (dis-similar metals in an electrolyte).

In situations of stray current corrosion the stray current will affect all metals, it will just show up on the zincs sooner. Zincs do not ‘protect’ the other metals in the case of stray current corrosion. So the SW dealer who said ‘be happy, your anodes are working’ was rather incorrect. Yes they are getting chewed up, but they aren’t doing a darn thing to ‘protect’ the other metals.
Old 05-23-2020, 11:16 AM
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I’m assuming that the swim platform is stainless. The swim platform has to be “electrically connected” to a current pathway exiting the boat from energy originating on the boat or passing through the boat. Divorce it electrically and it cannot corrode from electrolysis.

The fact that your zincs are not gone but a stainless object is corroding suggests the “problem” is physically close to a mechanical/metallic connection involving the platform itself forcing it to become an anode.

Put another way, if you were to remove the platform from the boat and suspended it in the water with a non-conductive cable, like heavy monofilament line, it won’t corrode unless your water is incredibly acidic or basic.
Old 05-28-2020, 01:09 PM
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Curious if you ever found anything my 2019 2500 has the same issue and anode is powdery has 40 hrs and stays on trailer in inclosed building. Has been in salt water maybe 6 days total in the last year fresh water other than that.

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