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Old 02-05-2021, 09:11   #1
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1979 42' Grand Banks Electrical System

I posted this on the Trawler Forum but hopefully will have more responses here:
I have started working on subject boat to clear a serious ground fault. I have not been able to locate the neutral bus for either shore power service or the safety ground bus.

It is unhelpful that the boatbuilder used black wire for everything.

I have a lot of experience on older boats but this one has me scratching my head and is probably the most poorly wired boat that I have seen in 21 years of doing this.
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Old 09-05-2021, 07:43   #2
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Re: 1979 42' Grand Banks Electrical System

Is the panel under the helm? On the 38 there is one large stud with all neutrals tied together; we usually pull them all out, tone and label, and re-crimp onto terminal strips; long, tiresome job ... send a PM if you'd like more specific aid (yes, I do this for a living, not asking to this job)
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Old 09-05-2021, 08:59   #3
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Re: 1979 42' Grand Banks Electrical System

Scot
PM sent.
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Old 09-05-2021, 13:29   #4
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Re: 1979 42' Grand Banks Electrical System

most grand banks have the netutral and ground buses in the engine room. and only the hots in the panel. they are also normally brown / blue / green euro colors

grand banks are normaly done pretty well
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Old 09-05-2021, 16:49   #5
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Re: 1979 42' Grand Banks Electrical System

@smac999: Not this vintage. If you look up the phrase FUBAR, there is a photo of the wiring "system" (I use that word very loosely) of this boat.
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Old 09-05-2021, 17:15   #6
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Re: 1979 42' Grand Banks Electrical System

Its been a while since I worked on a gb42, but I do remember looking at the back of the shorepower/genset switch and scratching my head. I was trying to figure out why the stovetop bit people. Seems like I may have been in the forward head and removed a panel towards the helm, but there was a fair bit of room and a lot of unlabeled wiring.
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