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Old 08-11-2016, 09:47 AM   #1
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Rewiring Grand Banks 36

Has anyone undertaken the task of completely rewiring a GB 36 (or similar type) trawler? If so, how long did it take? What was the cost? Any hints/advice?
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Old 08-11-2016, 11:48 AM   #2
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I rewired a Cheoy Lee 40LRC, although not completely. I reused most of the original DC wiring, replaced all of the AC wiring and added quite a few new AC and DC circuits. Originally, there were 12 DC circuits and 5 AC circuits. The original DC wire was 10 gauge and in surprisingly good condition. The AC wiring was a mess, undersized with some owner added circuits using Romex.

I started with a new 24 breaker DC and 12 breaker AC panel from Paneltronics and worked form there out. Prewired the new breaker panel at home, so just had to connect the circuits to the appropriate numbered terminal on the preinstalled terminal strips. For new wire, I used the next heavier gauge than 3% drop called for. Don't remember the time involved, counting just labor time, probably not more than 3 or 4 days (old man days, rarely 8 hours anymore) to pull old wire and install new wire.
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Old 08-11-2016, 01:36 PM   #3
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Not hard work , but a bit tedious.

Best on wiring is to be oversized not just Ok.

Purchase in 300-500ft rolls and be sure to use marine not auto terminals and a great crimp tool.

Anchor brand wire is 1srt choice .

And can be found in quantity.

The big decision is weather to copy exisiong or modernize the systems.

Same for wire color code Euro colors will probably replace USA red & black.

Install tinned star washers on any DC post.
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Old 08-11-2016, 02:10 PM   #4
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Has anyone undertaken the task of completely rewiring a GB 36 (or similar type) trawler? If so, how long did it take? What was the cost? Any hints/advice?
Again, define "completely ".

All new AC & DC wires, breakers, breaker panels, outlets, switches, new lights, new battery cables, chargers, etc., etc.?
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Old 08-11-2016, 02:10 PM   #5
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Has anyone undertaken the task of completely rewiring a GB 36 (or similar type) trawler? If so, how long did it take? What was the cost? Any hints/advice?
You'll get all kinds of answers and suggestions here. I urge you to pose your question on www.brandbanksowners.com to get answers and suggestions from folks that have actually rewired a GB 36. Good luck!
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Old 08-11-2016, 04:06 PM   #6
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I am in the final stages of upgrading my wiring. 80% has been replaced, although I left some of the original hard to get smaller runs through the cabinetry.
It's a simple boat electrically, but has taken much longer than expected. Probably well over 100 hours so far, but would have been less with better planning.

I read on another forum about a guy who rewired a 38 foot boat. The owner stripped out all the old, and did a lot of the new cable pulling and manual labour himself. He put in 140 hours, and a marine electrician put in another 120 hours. That's 260 hours in total.

I'd suggest that before you start - map it all out on paper. Everything. A list of every cable with wire size, length, colour, termination points, lug type and size, maximum current, cable run path.
Map out the position of all termination blocks, fuses, switches. List of stud sizes, bulkhead thru-hole sizes required, a cable labelling plan.

Its much easier & quicker if you do it on paper first, rather than planning as you go.
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Old 08-11-2016, 04:07 PM   #7
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I re-wired most of the DC & AC, including new batteries, charger/inverter. New Paneltronics AC/DC panel, new bilge pumps, new VHF, added fish finder to the CP500. Masterflush head. I'm still working on the LED lighting. I'd have to add all the receipts, but so far I'm around $5k in hardware. There was some woodworking as I relocated stuff in the engine space. I still want to add solar, since I don't want a noismaker.

AusCan
<snip>
Its much easier & quicker if you do it on paper first, rather than planning as you go..
<\snip>

Amen brother
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Old 08-11-2016, 05:01 PM   #8
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yes...probably $5K in materials...just the upgrade to a 50A 125/250V panel and matching DC panel were almost $2500 from Paneltronics.


very hard work in my opinion as pulling the wires in some spots and fastening to meet or nearly meet ABYC requirements was backbreaking in some areas and body positions.


easily a many month or two...could cut that in half if you had a helper and had most of the stuff on hand prior to needing it.


there are many ways to do it...that was just my way.
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Old 08-11-2016, 05:06 PM   #9
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Got to ask but why do you think you need to rewire?
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Old 08-11-2016, 06:24 PM   #10
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That 260 hrs, and the going rate of $100/hr or a skilled tech, is a whopping $26,000. Not so bad if you are doing it yourself, but I agree it will be a long and involved project, mostly because of access challenges. For someone to do it in 3-4 old-man-days (I love that term, by the way) seems nothing short of a miracle. Must have been a very straight forward boat with good access. I expect the work goes up exponentially with boat size, so maybe I'm over estimating what's needed for a GB 36. I'm envisioning my old GB47 and thinking "huge job". As others have asked, I assume you have good reasons for doing a full re-wire.
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Old 08-11-2016, 06:31 PM   #11
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That 260 hrs, and the going rate of $100/hr or a skilled tech, is a whopping $26,000. Not so bad if you are doing it yourself, but I agree it will be a long and involved project, mostly because of access challenges. For someone to do it in 3-4 old-man-days (I love that term, by the way) seems nothing short of a miracle. Must have been a very straight forward boat with good access. I expect the work goes up exponentially with boat size, so maybe I'm over estimating what's needed for a GB 36. I'm envisioning my old GB47 and thinking "huge job". As others have asked, I assume you have good reasons for doing a full re-wire.
What he said. ^
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Old 08-11-2016, 06:35 PM   #12
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I should clarify...


I was living aboard the whole time so again a much slower progress than possible...
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Old 08-11-2016, 09:46 PM   #13
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I'm in the process of rewiring my '71 GB 36 now. It is a slow and tedious process but progressing nicely. By 'rewiring' I mean that I'm doing the majority of it. I see no need to tear out headliners etc to replace perfectly good wire, especially when all the fixtures are being upgraded to LED. Everything in the bilge is getting replaced along with a new main and sub-panels by Blue Sea Systems. The DC circuits aren't all that bad but the AC is/was hideous. Romex, wire nuts, etc. Again, a new panel and all new wire for the AC. Make sure that everything is marine grade and I'd suggest staying with one manufacturer for everything. I'm using Ancor wire, lugs, terminals and Ancor crimpers. That way everything is designed to work together. Don't forget to use adhesive heat shrink on all the ends. It's been kinda fun in a masochistic sort of way but I have the luxury of having the boat in a boathouse and being able to work on it at my leisure. One more thing......label everyting....at both ends and even in the middle if you have access. I haven't totaled the cost yet but am guessing that it's around $3k and I'm pretty much done buying everything (famous last words). Good luck with your project. BTW, you might want to invest in Nigel Calder's book on electrical and mechanical if you don't already have a copy on board.
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Old 08-12-2016, 06:08 AM   #14
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ON the AC side , plan on a 240V 50A input , no downside besides a heavy power hose , and you may need the juice eventually.
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Old 08-12-2016, 06:23 AM   #15
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ON the AC side , plan on a 240V 50A input , no downside besides a heavy power hose , and you may need the juice eventually.
+1 All the new marina pedestals seem to be going to 50A as well
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Old 08-12-2016, 10:50 AM   #16
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Got to ask but why do you think you need to rewire?
That would be my question as well. Wire does not wear out.
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Old 08-12-2016, 10:54 AM   #17
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ON the AC side , plan on a 240V 50A input , no downside besides a heavy power hose , and you may need the juice eventually.
If you don't need 50 amps, there's little point in paying the extra charge at marinas. An extra $5 per night may not seem much but it adds up over the years.
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Old 08-12-2016, 10:54 AM   #18
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+1 All the new marina pedestals seem to be going to 50A as well
Adapters work fine.


They won't be changing the pedestals to 50 amp unless they change the wiring to the pedestal.
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Old 08-12-2016, 12:38 PM   #19
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Adapters work fine.

They won't be changing the pedestals to 50 amp unless they change the wiring to the pedestal.
I think that's what I just said.
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Old 08-12-2016, 02:09 PM   #20
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If you don't need 50 amps, there's little point in paying the extra charge at marinas. An extra $5 per night may not seem much but it adds up over the years.
You don't have to plug into 50 if you have a relatively cheap adapter. When I only need 30 amps service to keep the batteries charged and a few minor circuits (no heat or cool)...I just ask for a 30 amp.

But if I need it, the amps are there....plus...the 50A plugs are far more secure and less prone to burning or shorting.
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