1978 bonair tent trailer has a 110 plus 12 volt system but wires were cut from coverter. I would like a drawing of how to reconnect wiring system

Question edited for clarity.
Question moved to RVs.

It shouldn't do unless the controlling software is faulty. There should be a diode that only lets electricity flow from the solar panel to the battery in sunlight, but shouldn't allow electricity to flow back to the solar panel at night.

Batteries should last 4 to 6 years if they are looked after, and during the winter months, they should be on a battery minder to keep them trickle charged.

Any electrical items in the trailer tent like fridges, microwaves, televisions, heaters, AC etc, may be drawing some power when not in use either by design (standby) or by error (parasitic draw).

I tidied up the question a bit :>)

You have a regulator / control box issue. You have two systems;

You have a towable trailer. A vehicle battery in it that gets charged as you drive from a cable in the plug. When you stop that battery ceases to charge. No power in. If you use lights or use an inverter to take the 12 volts and turn it into 110 volts to run appliances, the battery is draining until it becomes flat.

So,..... we bring mains power hook up into the equation.

The mains power should run all your mains 110 volt appliances and provide a trickle charge to keep that battery topped up, but the battery is NOT actually being used, just being charged.

So that is the theory, somewhere you have a piece in the jigsaw puzzle that isn't working. You have a controller box that isn't doing what it is supposed to do. I don't know the trailer, you probably need a dealer that does. Fleetwood went bankrupt in 2009.

If you Google

fleetwood prowler electrical schematic diagram

There are wiring diagrams. I see a battery disconnect solenoid, but all of the dot .it Italian and .fr French sites as scam sites. There are also RV Groups that might be more help than me.

This might help

https://axleaddict.com/rvs/RV-Electrical-Tips-and-Reference-Data

Hope the information helps. A short term solution would be a full size batter charger charging your battery overnight after disconnecting it from the negative lead so just the battery is being topped up. You don't need an inverter if you have mains hook up.
..

First, I'm not a Coachmen RV Tech. (but most DC to AC inverters are not brand specific.)
* Check inverter fuse (on actual inverter frame). Replace.
* Check DC voltage at inverter. Should be 12 (or 24 VDC) depending on your system battery supply and inverter.
* Check the DC cable connections; crusty, dirty? Cut all power. Remove and clean terminals. Re-connect and check.
* DC okay? Check 110 VAC power at output of inverter. No power? Replace inverter. (possible power spike damaged it or it over heated)
* 110 VAC okay? Check the power panel breakers. If stuck in middle then turn all the way off to reset and turn all the way back on to activate. Check AC power at outlet(s)
* Still no power (at outlet)? Check all outlets. If some still works then there is a problem with the power (wires) distribution. You will need an electrician to trace the wires back to the break in circuit.
* Be safe. check your warranty and call for service.
* Note; your inverter may be on a separate warranty.
Aloha, ukeboy57

http://more119.gorumanuals.com/terry-travel-trailer-owners-manual-1996-moperpv.pdf

White Brown green and yellow are normally The 12 volt vehicle lighting colors, not 110 volt power. Generators do not have FIVE wires for the power wires out of your generator. Is this the remote control circuit? If so, I dont have a clue!

If you have input voltage 110 volts. On the white and black wires. No output voltage at the red and white wires. It's garbage there's nothing serviceable on the unit.

Not knowing the year or model makes this impossible to answer.

At yr breaker box if there is room add either a new 120v or 220 breaker and wire frm there. You need to check how much voltega and amp. Yr travel trailer needs. Plus how far away breaker box is frm trailer and get the correct size wire if needed. Make sure you have neut. And ground correct. Please doulble check. What iv offerd. For yr solution

A TRANSDUCER WILL STEP 220 DOWN TO 110 .
I BELIEVE AN INVERTER WILL BOOST IT FROM 110 TO 220 A ALL IN ONE TRANSFORMER WILL WORK

You have it correct the red wire will connect to vehicle red wire.