Wiring harness nightmares

Nov 12, 2014
90
Jeanneau 42 Northport
Hey gang,

Can anyone recommend a solid marine diesel electrical mechanic in Long Island. I need some serious help with figuring out my rats nest of a wireing harness. It's a perkins m50 by the way.

Cheers,
 
Feb 26, 2004
23,343
Catalina 34 224 Maple Bay, BC, Canada
Absent a reply, and not knowing anything about mechanics on Long Island, what most of us have done is obtain wiring diagrams and begin to figure it out ourselves.

I do understand, however, that not everyone has either the time or the abilities to make repairs. We do, though, figure it's a safety issue and learn all we can as we own our boats for longer and longer times.

Good luck, hope somebody can answer your question.

Wiring harnesses, of course, consist of the wires and the connections. Most often the wires are just fine, but the factory connections, many times made with horrible cheap trailer plugs are the culprit. 99% of the time from reports.
 
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Gunni

.
Mar 16, 2010
5,937
Beneteau 411 Oceanis Annapolis
So I google "northport ny + ABYC electrician", and get a number of hits in Northport.
Like this guy.
I don't do my own marine electrical, so that is how I find qualified help.
 
Nov 12, 2014
90
Jeanneau 42 Northport
I'm going to bunker down and take Stu's approach. I need to learn and I have the time.

If I really need reinformwnts I'll call in the profetionals. Thanks for that link Gunni.
 
Sep 14, 2014
1,290
Catalina 22 Pensacola, Florida
Yep its is usually the connectors. You have a circuit acting up, jiggle it a little and lo and behold the wire falls out of so called marine shrink wrapped connector. Or you check the bus bar and the rusty screw falls out along with the ring connector.
 

BarryL

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May 21, 2004
1,116
Jeanneau Sun Odyssey 409 Mt. Sinai, NY
Hey,
I am all for owners performing maintenance. After all, when you are on the water there is no one to call. However, dealign with electrical work can be dangerous. So don't be afraid but be sure and learn the right way to make connections that are reliable and safe.
BTW, Britannia in Northport has an excellent reputation for service.
Good luck,
Barry
 
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Nov 12, 2014
90
Jeanneau 42 Northport
Got myself a spare wireing diagram the other day to mark up, been studying it with my morning coffee. Making some good progress, it's not so bad..
 

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Jan 25, 2011
2,439
S2 11.0A Anacortes, WA
Figure out what functions your engine has. Ie starting, charging, oil alarm/indication, temp alarm/indication and whatever. Read your engine manual and also maintenence/overhaul manual. Now you know what you have and where to locate on engine. Get the wiring diagrams and start with one system and figure it out. Then go to the next. Once YOU figure it out, you'll have a better idea what needs attention and then document it and fix if necessary. Hopefully, if its OEM, the appropriate wires are identifiable. Dont get overwhelmed by a rats nest. Once you go through the progression, that rats nest will disappear..
 
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TomY

Alden Forum Moderator
Jun 22, 2004
2,769
Alden 38' Challenger yawl Rockport Harbor
I've been building a new cockpit this past winter. One task I just completed, was a new engine panel. Mine was original from 1961, starting with a Graymarine gasoline engine. Now 3 engines later, it's dog-eared and doesn't make a lot of sense.



Once I pulled the old panel out, I decided it was high time to deal with 20 extra feet of engine wiring harness they left coiled and stuffed behind - presumably when the first diesel was installed - in 1974. It was liberating taking wire cutters to that plug of wires. By the time I made that snip, I had removed the old instruments, switches, etc, and had sorted out what was going on (you can see why I've been building a new cockpit).





I built a new engine panel - a little bigger, a little deeper, out of a scrap of Lexan, the back lightly sanded and simply painted black.

A little elbow grease and a 3M pad brought the old gauges and switches back to life. I rewired everything in the new panel, from scratch. That was easy to do on a bench compared to in the boat.

Still a little archaic (the amp meters are the full flow type - which I'll replace in the future) - but improved. Once I lower the new cockpit into the boat in a couple weeks, I'll reconnect the wires(easy now).



The new panel is a big improvement.


[
 
Feb 17, 2006
5,274
Lancer 27PS MCB Camp Pendleton KF6BL
I'm going to bunker down and take Stu's approach. I need to learn and I have the time.

If I really need reinformwnts I'll call in the profetionals. Thanks for that link Gunni.
May I then make a small suggestion? If you plan on trying to figure out where what wire goes, do yourself a big favor and get a Fox & Hound wire tracer. You clip the "Fox" on a wire connector, then use the "Hound" to find the signal being sent by the "Fox". Once you have found it, tag that wire so you know what it is, where it comes from, and where it is going.

Fox & Hound is a trademark I believe, so any device that does the same thing will work.
 
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