Recent content by dragoon

I'm deleting my last comment as I wish to leave this conversation as a gentleman.....

I have no idea what your point is. Electricity and salt water are a poor mix around a metal boat engine. Corrosion is common, parts are expensive. Manufacturers fit isolated return parts to minimise the issue. Technically, if you want to eliminate as much as possible, they should use this...

This is very boring, honestly. I never knew anyone cared so deeply about an old 40 series engine. I can provide you links to the parts that are insulated earth if you're really interested. They exist. I've replaced some of them, and the modern replacements are insulated earth. Here's one...

I don't suggest you go into contract law. I stand by all of the above statements; 1) TECHNICALLY they should if you want to eliminate as much as possible the possibility for galvanic action caused through stray current. 2) Yes, this is correct. 3) I didn't say anywhere the whole engine was...

I don't need to make my mind up - it's the manufacturers. Where salt water and mixed metals are present, the best is to avoid the passage of electrical current - this is fact. When a manufacturer chooses to go down the route of isolated earth or not, or to make some of the components isolated...

I’m not getting confused, honestly . Electronics has been my career path for over 25 years. I agree with your statements, except that it’s possible to have an alternator with a negative terminal that is connected to the frame of the alternator. In this case, if the existing return is connected...

By return cable I meant the negative feed from the component back to the battery. My alternators do have a negative post on them which I would have connected. I’m not sure that this means in all cases that they are insulated earth though. I replaced a Landy alternator recently and recall...

That makes sense, but boat and boat part manufacturers do take this into consideration. Additional risk mitigation is included by adding detection, alarms and auto cut off for LPG systems. I’m not sure as much consideration goes into switch equipment above floor level though. But surely this is...

I‘m not saying anything, but as I’m not sure without testing them so I made that statement . They were replaced at some point, but I recall discussion with Volvo about a part number and design change together with an upgrade to output. Without going down there with a multimeter I don’t actually...

I’m not sure I fully understand your question.....but if they’re in the bilge where gas can build up undetected then you might want to give it some thought.

when you highlighted my original post, you conveniently omitted highlighting the word “technically” you might not need to change anything, depending on the modifications. A non insulated alternator or starter might make the connection between case and existing return cable.

diesel and no lpg on board maybe. This would be a minority of boats.

You don’t believe there is a risk of accidental ignition on boats?

You like the word nonsense don’t you? You can tell me it’s nonsense all you like. I have a boat with an insulated earth setup from the maunfacturer. It’s not a sail drive setup. I also have a boat that has a conventional bonding from the manufacturer. I can see both types exist. I would be...

When I’ve replaced the senders and oil pressure switches on my VP 40s I was advised I needed to use genuine two pole switches that were earth insulated. This is what was fitted by the manufacturer. I’ve seen them with my own eyes and researched the point of them at the time. These are still the...