12Volt issue inside trailer

[Buddhabelly]

Have an elite1 with just a charger. House power cord came disconnected and drained AGM batter totally dead. Was able to recharge it with a commercial charger and now holds 12.5 volts but, I have no power for 12 volts items.  I checked the power coming in from the battery and I get power to the bus bar and after that, I'm lost to where to trace for the lost of power. The charger is working because everything is working when useing 115 volts.  Can anyone recommend where I should be looking for somekind of breaker I can't seem to find.  No power going to the 12v fuse box either. Appreciate any help here....

[Steph and Dud B]

None of the 12v items work? Lights, fan, USB outlets?

[Galway Girl]

I think there may be a blown reverse polarity fuse:

 

from ai search

In an Oliver Legacy Elite I trailer, a reverse battery fuse (often labeled as a reverse polarity fuse) acts as a sacrificial safety shield to protect the trailer's electrical system if the house batteries are connected backward. [1, 2]

 

How It Works

• Instant Disconnection: If the positive and negative battery cables are accidentally swapped during installation, a massive surge flows backward. The reverse polarity fuses instantly blow to break the circuit. [1, 3]
• Downstream Component Protection: By blowing immediately, they stop the reverse current from frying sensitive onboard electronics, such as the WFCO power converter, the Xantrex or Freedom XC inverter, circuit boards, and 12V appliances. [1, 2, 3]

 

What Happens When It Blows?

• No 12V DC Power: The trailer will immediately lose all 12-volt battery power (lights, water pump, jack, etc.).
• No Battery Charging: Even if you plug the trailer into shore power, the Oliver power converter will not charge the house batteries because the path between them is physically blocked by the blown fuses. [1, 2, 4, 5]

 

Where to Find It

In the Oliver Elite I, these are typically two high-amperage (usually 30A or 40A) blade fuses located directly on the face or side of the main 12V DC distribution panel/power center. They sit slightly separated from the smaller individual branch circuit fuses. [1, 2, 3, 4]

If you need to replace them, ensure the battery cables are corrected first, or the new fuses will pop instantly upon contact. [1, 2]

If you are currently troubleshooting an electrical issue, please share:

• Are you getting power from shore power but not the battery?
• Have you recently swapped or disconnected your batteries?
• Are there any error codes showing on your solar controller or inverter display?

 

AI can make mistakes, so double-check responses

[Boudicca908]

15 hours ago, Buddhabelly said:

Can anyone recommend where I should be looking for somekind of breaker I can't seem to find.

I have very sketchy memory of a time when I couldn't figure out a similar issue (but I had not drained my batteries)...  the solution in my case was to reset the GFI protected outlet that (on my Elite2) is located on the face of the forward dinette bench seat. 

[jd1923]

2 hours ago, Boudicca908 said:

I have very sketchy memory of a time when I couldn't figure out a similar issue (but I had not drained my batteries)...  the solution in my case was to reset the GFI protected outlet that (on my Elite2) is located on the face of the forward dinette bench seat. 

Reset the GFCI outlet under the dinette when the other 120VAC outlets are not working. They are wired in series so the GFCI (Ground-Fault Circuit Interrupter) in the first position protects the entire circuit.

@Buddhabelly has the opposite issue, "no power for 12 volts items."

15 hours ago, Galway Girl said:

I think there may be a blown reverse polarity fuse...

Do we actually have said fuse in the Oliver? Maybe on the charger circuit board? (I'm not generally AI trusting.)

I guess he could have disconnected the batteries to charge them and then wired them in reverse polarity? (The only way this fuse would blow.)

17 hours ago, Buddhabelly said:

everything is working when useing 115 volts.

Because you're on shore power, or because your inverter is working?

15 hours ago, Steph and Dud B said:

None of the 12v items work? Lights, fan, USB outlets?

It always gets me when a request seems really important, "WE HAVE NO POWER!" Then the person asking for help doesn't login for the next 17 hours... We can only help those who help themselves! So much we do not know without follow-up questions answered!

@Buddhabelly, your answer to @Steph and Dud B's question?
And is your inverter working? (if you have one)
And re another 12VDC item, are your stabilizer jacks working?

Edited 4 hours ago by jd1923

[Galway Girl]

In our 2019 E2 we have reverse polarity fuses.

[Tom and Doreen]

On the 2023 Elite there's also a breaker (60A) for the +12V systems, it's probably a Optifuse like in the Elite 2s. I don't know where it would be located on an Elite but probably under a seat or bunk.  The load side of this breaker connects to the fuse panel. The input side is connected to the +12V bus bar. 

Edited 3 hours ago by Tom and Doreen

[jd1923]

15 minutes ago, Galway Girl said:

In our 2019 E2 we have reverse polarity fuses.

Thanks Craig. I just checked my panel label picture, and we have similar labeling.

I guess these only protect the circuits connected to the various fused circuits in the 12VDC panel. For a reverse polarity condition to occur, you'd have to connect your battery cables in reverse or rewire AND reverse the internal OEM 12VDC wiring to the panel. This could be cause here if the batteries were removed for charging and then connected backwards! 🤣 

The 4/0 cables from the battery connect to the inverter first (when present), these reverse polarity fuses would not protect the inverter from reversed wiring. Inverters must have their own internal reverse polarity protection.

More guessing until questions are answered...

[Buddhabelly]

Thanks for trying to help everyone.  I wish Oliver would let us owners have and electrical diagram so we can tell where all the relays and circut breakers are hidden.  After countless hours of testing and looking around I finally found a breaker hidden at the bottom of the trailer below the negitive ground terminal on the outside of the battery box.  There are two switches on the breaker.  One is on the front side and easy to see but, the other is underneath the breaker and is a swing arm thats hard to see. That was the one that popped.  Everythings is honky dory now. Thanks again for trying to help....I really appreciated it. 

Edited 2 hours ago by Buddhabelly