Ok you RV wizards and EE specialists, I have a situation for you.
I just replaced my battery, totally dead even though it was always hooked up to 110 wall power. Its voltage was almost 0, so something was draining it. I had the understanding that being connected to wall power would trickle charge the battery? Either I was wrong or the charging in the unit does not work. It's also stored in a storage unit, so no solar.
Once the battery was replaced, I could once again use the power tongue jack, I also thought the jack could be used while only plugged in, but it did not work at all except when the battery works. Is that right? Battery is now in place, connected and the unit is plugged into wall power (110 with converter), and everything works. If I pull the wall power, shouldn't I still be able to use the lights in the trailer? They do not come on, nothing does. I tried the battery switch in both positions and still nothing. So I'm not getting battery power to the unit. Suggestions on where to look? Fuses?
I also checked voltage across the new battery stand alone, 12.8v and 12.8v while completely hooked up with wall power. If the internal unit charging was working, it should have read more then the 12.8v. So I'm at a loss and looking to the RV wizards to help me think right. Thank you in advance.
To answer your first question, the jack draws a lot of power, so you need a charged battery for the jack to function.
I had a similar problem with my battery - but a different cause. When the dealership hooked up the battery, they wired both the white (ground) and black (hot) to the NEG battery terminal. The only wire on the POS terminal was to the jack.
Unfortunately, since my MAX is on shore power, I did not notice the problem right away. By the time I did, the battery was dead (due to not receiving a charge.)
I am currently trying to figure out what does and does not work on battery power only.
I did figure out I can listen to the radio on solar only - albeit with terrible background noise.
I am also looking into how the battery switch is wired in. I don't get the expected behavior from mine.
Thanks Scott. Mine is also wired the same way, white and black to the neg battery terminal. You're saying this is incorrect? How should it be? I was questioning this also, but was giving the dealership some cred. I also do not get what is expected from the battery switch. As I break this down more, I will post what I find. Any insight is always helpful, thank you for your post.
Any chance I could get someone to take a picture of their LG battery wiring and post it? Mine may have been wired incorrectly but I want to make sure. Appreciate it.
Dennis
