2014 S Maxx
2011 Tacoma 4cyl ... edit: 2022 Tacoma 6cyl - oh yeah!

A_Little_T@b'll_Do_Ya


2021 T@b 320 Boondock "Mattie Ross" | 2021 T@b Nights: 239 | Total nights in a T@b 455 | 2022 Jeep Grand Cherokee L Overland | T@b owner since 2014

Is the trailer unplugged from the tow vehicle? If not, unplug it and check the trailer battery voltage and see what it reads.... Check the glass fuses on the ALDE unit as shown below.elmeaux said:Shore power is definitely not charging the battery. Woke up this morning with no heat and the Aldi complaining "battery too low." Checked meter and it said 10.1. Shore power has lights etc working. Not sure what to look for to trouble shoot this. Gonna be a cold night tonight.








Your trailer lighting and components "should" run with the battery shutoff switch in the "off" position. When you have the trailer plugged into shore power the electric converter allows 120 volt power for the electric receptacles and also provides 12 volt power to all 12 volt components inside the trailer. The battery "on/off" switch is merely a means of isolating the battery from the electric converter and trailer circuit components.elmeaux said:Also flipped the breaker to the battery off and on to make sure it want tripped. Last read was 9.1 so I'm guessing battery is pretty much shot. LPCO is now beeping to indicate battery status as low. There's a factory installed cut off for the battery in the front box. I turned it off to stop the beeping but I get no shore power with that off.

What you describe is how I assumed it should work.Michigan_Mike said:Your trailer lighting and components "should" run with the battery shutoff switch in the "off" position. When you have the trailer plugged into shore power the electric converter allows 120 volt power for the electric receptacles and also provides 12 volt power to all 12 volt components inside the trailer. The battery "on/off" switch is merely a means of isolating the battery from the electric converter and trailer circuit components.
But the battery shutoff switch does need to be turned on for the electric converter in the trailer to charge up the trailer battery while on shore power. If you were running off of shore power and the battery switch happened to be turned off it would not be included in the circuit and thus would not be receiving a charge via the converter.
And if the tow vehicle charges up the battery while running you obviously are okay on that end of the battery. I smell a bad ground or incorrect trailer wiring here and would be curious as to how long you've owned your trailer and had it in your possession before you started noticing this problem?
If you are not getting power "inside the trailer" with the battery switch in the off position and "while plugged into shore power" it sounds like someone incorrectly wired something up via the electric converter in the trailer. I'm wondering if the ground wire in the bench seat next to the Alde unit is unhooked as a bad or insufficient ground would cause your problem.
If I remember right both on the left in the picture(the green/red and the white) went into a bit of conduit that went to the shutoff. I have to park my trailer offsite so I'll verify later.
I would follow the battery shutoff wiring back into the trailer too as this sounds like the potential source of your problem. Which wire (+ or -) is hooked to this switch?

