Shore power transformer
 

I have a new-to-me 1988 Formula 311 SR-1 that has been essentially completely redone/maintained/re-engined/etc... The previous owner used it on lakes and seems to not have even tried to use the shore power set-up. I plugged it in and got no lights, etc...so I opened the panel. As you can see in the picture, I found the main fuses all missing. I am trying to figure out what fuses go in the four locations AND how to safely (without starting an electrical fire or blowing out other fuses and circuit breakers) check to see if the bos works as advertised. My initial assumption is that the fuses were removed during rework and were just replaced...but if they were removed "for a reason" I don't want to find out what that reason was the hard way.
Thanks,
Tom
https://cimg7.ibsrv.net/gimg/www.off...c753a2d2ed.jpg

Looks to me like the panel was never connected to anything, as there aren't any wires connected to the individual circuits. Fuse size is mostly determined by connected wire gauge. After helping my brother with a wiring problem on a boat he bought, I won't turn anything on until I trace the wiring myself. His 120VAC circuits were all wired wrong and would have toasted his boat had he started his generator. Could be they are just using the inverter to charge the batteries?

Thanks, I will investigate more!

Is that a old school inverter? The fuses are clearly 12V. The circuit breakers are 110V. If you pull the lower panel it may reveal more...........

You have opened the 12 volt side of the panel. Agree that it looks like it wasn't used.
Agree the 110 volt side is in the bottom. And those breakers look like they are in the off position.

They are off...I found them that way and flipping them on did not illuminate the LED, so my inspection got deeper and I stopped when I fuses missing. I will investigate further. For now, I will just keep a trickle charger/battery tender in the boat to keep the batteries fresh.

Where are you located? Never mind, I just saw yo post in the next topic. Friend of mine has a new to him 357. His shore power was all jacked up, took it to Burgers in Lake Ozark. In and out in 60 mins. All good now.

Roger that. As you probably discovered, I am near Pensacola, Fl. (western panhandle). Anyway, I will slowly "wring it out"...I KNOW electrical engineering (as I had to take it twice as a mechanical engineering student).
Tom

So, it looks like the lower part of the unit has wires attached and the upper part shows 12+ Volts DC across the red/black contacts when the Perko switch is on and 0 V DC with Perko off. Any suggestions for the next safe troubleshooting step?
https://cimg4.ibsrv.net/gimg/www.off...94783eda97.jpg
https://cimg6.ibsrv.net/gimg/www.off...e994ce2871.jpg

See pictures...does it look like I just need to install fuses? What size (fuses)?

what are you trying to operate? It doesnt look like a fuse will do anything, there isnt anything connected to it.

Agree, depends on what your wanting to run
First one on the right is the main fuse to feed the other 3 to the left

I am trying to get the shore power transformer to work as advertised. I would love to see a picture with wires attached as factory. Think I have a god schematic but a labeled picture would be IDEAL.

The cockpit 110V outlet works when shore power is attached. Now I kinda believe the system is installed and working BUT the LED (that tells me how the charging) seems to be burned out...BUT I would like to confirm.
Can someone tell me (with shore power hooked up) where to check for battery charging voltage and what the readings (volts DC) I should be seeing (depending on the selection on the Perko switch).
Thanks

Should see at least 14V on the battery when charger is ON

If you do not have any factory manuals, they are available on line for free. Formula published very detailed drawings and schematics for their boats.

You may want to upgrade the battery charging system if you are using AGM batteries. The internal resistance and voltage is slightly different than typical lead acid batteries. I use a Pro-marine dual battery set up that has different modules for different battery types.

Here are a few things that may help
.

• In that panel as others have noted you have no circuits connected, the 12V+ positive (red wire) goes to the 12V bus side and there are no wires connected to the the 12v terminals
• Black wire is the 12V-
• You would have to determine what you wanted to run, wire it to one of the output terminals and add the correct fuse
• You are asking about a battery charger typically a charger is 110V and has its own step down transformer to provide about 14V DC as someone else mentioned.
  • Typically a battery charger would not be 12V DC in with 14V DC out..... It is possible electrically to do this but I have never seen anyone use a buck boost transformer in a marine application
• With all the above being said I would go to the battery charger itself and check for 110V power at the charger (input power) with the 110V breakers turned on
  • To help look at the wiring going into the charger it should be black, white and should have a green wire (ground) this would help to indicate its 110V wiring. You may have to take the cover off the charger
• No power at the charger trace the wires back to see where they land they should land to one of the 110V breakers

I have assumed basis you posts that you have a multimeter

If you need more help send me a private message and I'll give you my number.

As a final note since your checking everything when all done make sure that the ground bus that has all your green wires landed on it actually has a green wire that goes back to your shore power plug this is critical to the safe wiring of the 110V AC power inside your boat

Thanks...I'll try to follow your advise/suggestions/tests.

You may have sorted this already but here is some more information
Company website that made the unit: https://www.progressivedyn.com/
Picture of another unit like yours but larger : https://www.google.com/search?q=Char...byMOVSgCT7IHxM

Looking at the larger unit you can see the circuit board for the battery charger is located behind the panel as I would bet yours is also. This would mean their is no charger by the batteries and is all located in the unit in your pictures. You can likely get it fixed either yourself or Progressive Dynamic may help but I would not charge anything but plain jane lead acid batteries on it.

Good luck with the project.