Typical wiring to / from battery selector switch?? - Page 2 - SailNet Community
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post #11 of 19 Old 07-13-2009
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Use this calculator

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Originally Posted by Northeaster View Post

Patrick - thanks for the advice on the wiring chart. I will calculate things before replacing.
Forget manual calculations I use this great on-line wire calculator. Bookmark it !

AWG Wire Gauge Calculator (LINK)

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post #12 of 19 Old 07-13-2009 Thread Starter
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Mainesail - Thanks for the link.


I would still like to know where the other wire goes, from the battery selector switch, common post. I may disconnect it temporarily, and see if anything stops working. Could very well be something that is not used anymore.
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post #13 of 19 Old 07-14-2009
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Quote:
Originally Posted by Maine Sail View Post
Forget manual calculations I use this great on-line wire calculator. Bookmark it !

AWG Wire Gauge Calculator (LINK)
Great link. Thanks Maine!

Patrick Rea

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post #14 of 19 Old 07-14-2009
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Quote:
Originally Posted by Northeaster View Post
Therapy - you are right , of course.. it is better to make it perfect. However, it has worked for 30 years with the current wiring, and is still floating. If I improve things by changing the feed from 14 ga to 10 or 8 ga, for example, it will ceratinly be better than it has been (for 30 years).
re: emergency, yes some things like running lights, steaming light, bilge pump and electronics could all be used at once. But I doubt that I would also "need" to turn on the water pressure pump, anchor light (assuming we are moving), all five or six cabin lights, etc, during an emergency as well. So I think that some common sense can be used in determining wire size.
You know..........

You are absolutely correct.

I should not have used a cursury blanket statement like that.

Let us know what that last pesky red wire went to.

A friend of mine bought an old Catalina and when we disconected one of the batt hot wires the shower sump pump came on.

I did not figure that one out as he sold the boat a few months later.
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post #15 of 19 Old 07-15-2009
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Whether by color, direction etc, it should be traceable, shouldn't it?
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post #16 of 19 Old 07-15-2009 Thread Starter
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Therapy - I didn't mean to sound like an a$$. Juts meant that, alothough I usually do try to do things right, any improvemnt is still better than it has been for 30 years (ie from 14 ga to 10 ga, etc)
Of course, I am putting more electrical demands on it than it had 30 years ago, when new!


Well, the other red wire (positive lead from Common post of battery switch) went to a small unfused distributions block, which feeds the VHF radio, an who knows what else. I will be trying to trace out the other wires at some point. Or at least disconnectting them, and seeing what doesn't work. Most items are accounted for on the DC panel, and now I know how the VHF is powered.

Next I will be looking at how big of a DC feed to use to replace the other red wire ( the main feed for the DC panel).

Thanks to everyone for their help. I have worked each of the last 2 winters on more important projects. Now, I would say that cleaning up / replacing alot of the wiring will be this winter's project. There are alot of butt connectors used to lengthen wire runs, and I am afraid to pull too hard on wires to trace them as I don't want to pull them apart. Will replace any of those wires when I have a chance.
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post #17 of 19 Old 07-19-2009
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mystery wire

My guess is it goes to the alternator.

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Originally Posted by Northeaster View Post

Back to the original question, where else could that other wire go, from the common battery switch post???

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post #18 of 19 Old 07-19-2009 Thread Starter
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Pegasus - thanks for the reply. You are correct, that one red wire does go to the alternator. However, the one that I could not account for went to a non-fused distributionb block for things like my VHF, stereo, etc, that were not wired to the fused / toggle switched DC panel. These devices all have in-line fuses. I guess they wanted these devices to come on, as soon as the battery switch was turned on, without having to flip on certain panel toggle switches.
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post #19 of 19 Old 07-19-2009
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Quote:
Originally Posted by Northeaster View Post
Pegasus - thanks for the reply. You are correct, that one red wire does go to the alternator. However, the one that I could not account for went to a non-fused distribution block for things like my VHF, stereo, etc, that were not wired to the fused / toggle switched DC panel. These devices all have in-line fuses. I guess they wanted these devices to come on, as soon as the battery switch was turned on, without having to flip on certain panel toggle switches.
More likely the DC panel ran out of breakers before they ran out of boat bucks .

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