What you have is what I would expect to see as a ground system for a SSB, AM transmitter (really old), or LORAN. Also note I don’t really like using the engine as a central grounding point. BlueSea sells a number of terminals you can use as the central grounding point and then run one heavy ground wire to the engine. The mast should be connected to the keel bolts, but IMHO you can get rid of the metal plate (a dynaplate maybe?) and the extra wiring. You could have a ground loop issue if you started grounding things to the plate or the keel bolts. You would end up with voltage differences between the engine, the plate, and the keel that could prove quite destructive. If you do nothing else, make SURE nothing is connected that way. Joe Coquina C&C 35 MK I
BTW – I had a ground loop issue at work. My phone was somehow wired to the exchange in another building ½ mile away. There was enough difference in ground potential at the two sites that significant voltage was present on the phone wire and it was introducing horrible noise. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Pete Shelquist via CnC-List Sent: Thursday, April 07, 2016 10:27 PM To: cnc-list@cnc-list.com Cc: Pete Shelquist Subject: Re: Stus-List Ground loop? Sounds like the PO may have been misinformed, or overly cautious, and figured more is better. Someday will someone explain to me the concept/theory of a ground loop? I’m looking at you Fred. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Ken Heaton via CnC-List Sent: Thursday, April 07, 2016 5:59 PM To: cnc-list Cc: Ken Heaton Subject: Re: Stus-List Ground loop? Did the boat ever have a shortwave radio? Was a previous owner afraid of a lightning strike? Just guessing. Ken H. On 7 April 2016 at 18:20, Ryan Doyle via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Hey everyone, I am in the home stretch of re-wiring my entire boat. The wiring was in frightening shape when I bought it back in October - much of it was corroded and probably original, and there were numerous "bad fixes" that I didn't like the looks of. So, I ripped it all out and started anew with a whole bunch of Ancor marine wire, a BlueSea panel, BlueSea fuse blocks, and went about re-wiring. All negative wires connect back to the nut at the back of my A4 motor, which is also connected to my battery negatives. All good. However, there is one large gauge (maybe 10 gauge?) old wire going from the nut on the back of my A4 to a nut attached to a metal plate that is attached to the outside of the hull. This metal plate is located slightly forward and to starboard of the front of the A4. Another wire coming from the nut over this metal plate is also connected to a keel bolt. I don't see this plate or wire on the original C&C wiring diagram for the boat. And from what I know, having more than one negative point outside the hull will create a ground loop. Any thoughts on why someone did this? Thanks, Ryan Nobody's Bargain 1976 C&C 30 mki New York _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
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