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tweeet65
1st Mate

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USA
55 Posts
Initially Posted - 06/28/2012 :  11:05:33  Show Profile
All,

I can't beleive how great it is to float a question and get such helpful responses. Thanks.

I rewired my '77 and was confused by the diagram in the manual that said mast requires separate ground. At this point, my panel is grounded back to the battery. What are you using for a separate ground without an engine to gnd to?

Thanks again,

dave
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 06/28/2012 :  11:37:02  Show Profile
All 12 volt circuits eventually ground to the negative post on the battery. A lot of people install a buss bar to collect all the grounds and the buss bar is grounded to the battery.
Hope that helps.
Edited by - Sloop Smitten on 06/28/2012 12:12:31
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JKBIXBY
1st Mate

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USA
38 Posts
Response Posted - 06/28/2012 :  13:17:14  Show Profile
Dave,
On my 77 I run all the neg back to a buss bar then to battery. Will be replacing panel this fall. What panel did you use? Also my panel is set up from left to right, toggle switch with fuse and red light, what is this for, don't seem to remember. Then main panel, followed by two meters (volts and amp draw) and finally two toggle switches that control the two ac outlets on the boat.
Thanks,
John on Ms Achsa 77 SR/FK #77
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Voyager
Master Marine Consultant

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USA
5408 Posts
Response Posted - 06/28/2012 :  15:30:00  Show Profile
Take photo. I'd be very interested in seeing that setup.
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Stinkpotter
Master Marine Consultant

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Djibouti
9082 Posts
Response Posted - 06/28/2012 :  17:36:17  Show Profile
If by "mast" you mean the metal extrusion and not the wires inside, I think there's some confusion about the term "ground." It's commonly used in car and boat DC systems to mean the negative side of the circuit, going back to the negative terminal on the battery. Since the positive sides of the various circuits are switched, the negative side can be "collected" via a buss-bar, and then a single wire can go from there to the battery.

Grounding a mast (and bonding other metal components) is a whole separate, complicated subject that very few sailors address, and that has nothing to do with the DC wiring. To do it right (and not make things more dangerous instead of less) takes some serious components and work--depending on the method (and theories) you select. You can "Search" for "lightning" on our General Forum and see lots of discussions/debates... The net of it is most of us fuggetaboutit.
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tweeet65
1st Mate

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USA
55 Posts
Response Posted - 07/03/2012 :  15:03:58  Show Profile
I do have the green to the buss and buss grounded back to the bat. I am going to try and clean the fuse holders on my old panel and replce all fuses. the fact that the speader light comes on but none of the others is perplexing. I worried when I connected them all that I would screw it up, I carefully planned and mapped the entire diagram.

dave
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glivs
Admiral

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USA
836 Posts
Response Posted - 07/03/2012 :  16:28:31  Show Profile
Dave....sounds as if corrosion in the deck connector may be the fault - a common problem. Take a little emery cloth and clean each male and female connector and try again.
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 07/04/2012 :  09:34:40  Show Profile
Grounding vs bonding

http://www.westmarine.com/webapp/wcs/stores/servlet/WestAdvisorView?langId=-1&storeId=11151&catalogId=10001&page=Marine-Grounding-Systems

On a C25, the GROUND is the (-) of your battery banks.

Do NOT connect the mast to your electrical system ground.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.