Brand New Battery Dead

[SJ Communicator]

It Never Ends! lol
Getting ready for our biggest trip ever. Today was set up WD/Anti sway hitch day. Disconnected shore power to move TT to level ground to set up hitch. Went to use electric tongue jack, nothing. Went to check battery meter on control panel, nothing. Got multimeter battery dead! Battery (marine deep cycle) was just bought brand new and installed Wednesday 03/20/24! Barely registered 1 amp on lowest DC setting on meter. Battery taking charge now. Found blown 30 amp fuse on wire harness just after J-Box between battery & camper. Everything works on shore power. Any advice will be greatly appreciated.
Thanks in advance

[colby]

Originally Posted by SJ Communicator

It Never Ends! lol
Getting ready for our biggest trip ever. Today was set up WD/Anti sway hitch day. Disconnected shore power to move TT to level ground to set up hitch. Went to use electric tongue jack, nothing. Went to check battery meter on control panel, nothing. Got multimeter battery dead! Battery (marine deep cycle) was just bought brand new and installed Wednesday 03/20/24! Barely registered 1 amp on lowest DC setting on meter. Battery taking charge now. Found blown 30 amp fuse on wire harness just after J-Box between battery & camper. Everything works on shore power. Any advice will be greatly appreciated.
Thanks in advance

How old is the trailer? If you are on shore power, check and see what the output is on the battery leads. You should see 13.9 or 13.6, if not, check breakers and fuse for the converter, it may not be working properly if the breaker/fuse is OK.

[SJ Communicator]

Thank you for the quick response! My rig is a 2019 Jayco 24RL. Everything works on shore power! I will check the leads once I get a charge on the battery. What do you think would've caused the 30amp inline ground (green wire) fuse to blow? I am concerned about hooking up my TV now...

[Grumpy]

Originally Posted by SJ Communicator

Thank you for the quick response! My rig is a 2019 Jayco 24RL. Everything works on shore power! I will check the leads once I get a charge on the battery. What do you think would've caused the 29 amp inline ground (green wire) fuse to blow? I am concerned about hooking up my TV now...

Green isn't ground, white is. If you have the green on the neg side of the battery you have it connected wrong..

[craigav]

Originally Posted by SJ Communicator

Thank you for the quick response! My rig is a 2019 Jayco 24RL. Everything works on shore power! I will check the leads once I get a charge on the battery. What do you think would've caused the 29 amp inline ground (green wire) fuse to blow? I am concerned about hooking up my TV now...

It is very rare to see any fuse on a ground wire and a 29 amp fuse is also very rare (I am not sure they even exist). Perhaps more details would be of value. Also to note, while green wires are almost always used for ground when used for AC voltages, the RV could be setup to use a green wire for a non-ground wire in particular for RV usage (vs AC 120v+ usage). I would verify where it originates and terminates to be sure. ~CA

Also to note, I checked as I remembered that "GREEN" is often used in the trailer connector for the trailer tail lights, often the running lights or the right side turn/brake lights depending on how it is setup. ~CA

[SJ Communicator]

All I know is that the wire color was green and there's an inline 30amp DC fuse that was blown. So I am assuming this is a fuseable link of some sorts. I only said ground as usually on 110 green is ground (Black= Hot, White = Neutral) I will take the Jbox covet off to see what it's tied into.

[SJ Communicator]

I bought this TT brand new and other than adding a rear Camera on the pre-wired set up. There have been no electrical modifications made. Should I be concerned about hooking it up to my TV? I would hate to have a spike, direct ground orsomething hit 2018 truck electronics...

[SJ Communicator]

29amp was a typo from my fat fingers and tiny lcd keyboard keys lol. Comment has been edited to correct

[SJ Communicator]

Okay I just pulled the J-box cover off and the green wires the 30amp fuse is tied into one wire nut with all black wires (4) and one wire nut with one red and 3 blacks. So I see is definitely on the hot side.

[craigav]

Originally Posted by SJ Communicator

I bought this TT brand new and other than adding a rear Camera on the pre-wired set up. There have been no electrical modifications made. Should I be concerned about hooking it up to my TV? I would hate to have a spike, direct ground orsomething hit 2018 truck electronics...

I wouldn't want to connect to any trailer where a wire(s) on the main harness is blowing a fuse(s) and I would investigate why that occurred (or is occurring) and correct the issue prior to connecting your truck to the RV.

With that in mind, I have never seen any truck not have all of the trailer connector plug connections (except the ground connection) fuse protected (sometimes breakers, fusible links, etc.) so I wouldn't expect any damage at all to the truck other than possibly blowing some hard to find fuse(s). Keep in mind that some trailer connectors (especially older trucks but perhaps newer ones as well) have common fuses so if you did blow the fuse for the turn signals (just an example, could be brake lights or any of the circuits) then your turn signals may also fail on your truck until you replace the fuse and disconnect the trailer connector. ~CA

[SJ Communicator]

Just as an update, once I replaced the 30amp fuse we had no issues for our entire trip from Tampa Florida Lake Buchanan Texas! Battery held a charge and now fuses blown. We even had to rely on 12v only for a couple single nite layovers at Harvest Host sites there and back. The only thing I can think happened was, there must of been a spike from a lightning strike or another type of surge that wiped out the inline fuse. But everything worked fine and I am very happy about that.

[JFlightRisk]

Happy you're back in business. Thanks for the post.