Proper Bonding / Grounding -

The attached photo's are from an Ericson 28+ that I just purchased. After seeing that their was some green on a bunch of metals, I automatically knew some grounding/bonding was not happening correctly. After looking around in the engine compartment, I identified that the green wire coming out from the Ericson AC Box was frayed on the end, and not connected on the other end. I believe it is either an Atomic 5411 or 12HP version.
Can anyone point me to where this other end should be connected? Most presumable somewhere on the engine block to complete the grounding plane. Thanks.

No

If it's coming out of the AC box do not connect it to the engine block.

Afrakes said:

If it's coming out of the AC box do not connect it to the engine block.

Click to expand...

Then were should it go? Thanks.

AC and DC

Your AC and DC wiring circuits should be totally separate. The DC system grounds at the engine block. The AC systems grounds only when you are hooked up to shore power. That wire is probably abandoned from a device no longer there. Trace it back into the AC distribution panel, make sure you are not hooked up to power, to see specifically where it originates. If it is connected to a breaker, what does the label on it say?

I know there is some debate on the issue, but I believe ABYC standards call for linking the AC ground to the DC ground at some point. Which doesn't prove what that particular wire is for...

e.g.: http://www.rjwsurvey.com/uploads/Grounding.pdf
https://www.westmarine.com/WestAdvisor/Marine-Grounding-Systems
https://www.proboat.com/2015/04/the-mysteries-of-bonding-systems-revealed/

Galvanic Isolator

Haven't done a ton of research but in ABVC there is mention of the presence of an isolator between AC and DC systems to prevent corrosion of the AC systems components due to stray currents. Wouldn't expect that on a 80's vintage boat. But what I don't know fills many tomes.

toddster said:

I know there is some debate on the issue, but I believe ABYC standards call for linking the AC ground to the DC ground at some point. Which doesn't prove what that particular wire is for...

e.g.: http://www.rjwsurvey.com/uploads/Grounding.pdf
https://www.westmarine.com/WestAdvisor/Marine-Grounding-Systems
https://www.proboat.com/2015/04/the-mysteries-of-bonding-systems-revealed/

Click to expand...

Yes indeed. Great references in which applies to what I already knew. Both grounds should merge at one time.

As you stated, the question still remains to: What does the Green wire go too????