OK this may confuse some of you... Others are going to know right away.

I am checking out the AC wiring on my boat, both before plugging it in, and to add a battery charger. As you may recall from an earlier post, I discovered the several (heck, all) of the outlets were corroded in some manner... the pins that held the plastic body together had eroded away... so essentially the metal bits were held in place by friction and the wires in the back holding them in place.

Had I just plugged in the AC power to the pier and then plugged in some device as simple as a lamp... there is a good chance the outlet would have simply fallen apart and allowed the hot and neutral lines to touch. (think big sparks!)

So I have gone throughout the boat and checked the wiring and have replaced all the AC sockets with nice new "outdoor" rated Leviton GCFIs (except the one in the head... which I wired "downstream" to another GCFI... which allowed me to use a weather cover on that particular outlet).

Meanwhile (here comes the question) while inspecting the wiring, I have noticed that perhaps the AC "shorepower" connection at the gunwale may not be wired correctly.

BTW throughout the boat the wiring convention used for the 12GA stranded cable is yellow is ground; yellow/red is hot; and yellow/black is neutral.

When I ring it out, it appears that the twistlock has the W connected to ground, and the wide bent pin is hot, while the remaining pin marked B is the neutral. This is exactly what the boat wiring diagram shows...

But on the interwebz (I only found one site that had wiring info) it appears that a NEMA L5-30 plug is to be wired with the W as white (neutral), the wide bent pin as Ground, and the remaining B is Hot. (that actually makes sense)

Now frankly I am not really sure, and what I see on the boat can easily be a DPO issue. (although there IS that wiring diagram... )

Of course I could just go to the power box on the pier and measure the voltage there... But here I am on the interwebz, hoping someone out there has the right answer.