Thanks, I would have never figured that out.
So, the black switch is an A, B, C toggle. A is pump only, B is fridge only and C is all of camper and fridge, but not pump.
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update, from what I see so far:
Two power sources are 1. the battery and 2. the junction of trailer TV 7-pin wire and Charger. (side thought: technically with TV plugged in the charger will put 12+ to the TV plug? absent a relay or the charge coming through the ignition it could charge TV batt too.)
The 7-pin plug and the charger are wired to the same junction. Red wire goes to charger form junction, and blue goes to the fridge. There is a black wire at 7-pin junction that goes to battery.
On the other end, from the camper fuse panel, there is a big red wire going to the black switch (or coming from it). I assume this is 12+. Seems that same connection also continues to battery.
There is a small black wire coming from black switch to I am not sure where, could be fuse panel, or maybe straight to fridge, may be with the safety cable pull thing.
I am confused how the power routes, and lots of black wires, seems they had a surplus of black when building this.
#1, there is a black wire going to fridge from the fuse end, maybe that is 12+ to control a switch to turn on power to the fridge?
#2 I assume the power gets to fridge from the charger/converter, which is a direct shot. OR from the battery, through the black switch, to the fuse panel (or bypass that), and around the shower back up to the fridge. But I do not see any labeling for "fridge" on the fuse panel, so maybe it by-passes the fuses.
Also the other black wire that goes from battery to the 7-pin junction, which is wired with both the charger and the blue wire directly to fridge, so the fridge basically is connected directly to the battery this way? So, the black switch must control some sort of relay switch on the fridge that the 12+ must pass to get to the fridge, and 12+ passes through that relay (on switched or un-switched side)to the fuse panel from the fridge relay.
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update again:
I am still uncertain if lines cross with the fridge…
Where does the cable that you pull on go? I see a vinyl tube carrying it under the table, but is hidden by carpet. Does not go under the floor to outside, does not seem to come out the other side of the table carpet area. Is it going to a special place? Is it just a long tube with a spring inside that just needs a few feet for the spring?
Maybe the black #14g wire going with it goes to a switch??? The switch is just mounted under the carpeted box?? but there is no return wire, so can't be the switch under carpet. so, confused where black wire goes still too.
What I may do is isolate the #10g red wire coming from the battery (to the black switch) from the rest of the camper. Run the #10 red wire to a new on/off switch to power the white lift switch.
Then the black 3-way switch will be powered by the new golf batteries. Thus, the two battery banks are not touching.
I will also isolate the power feed from the charger, put it on a 2-way switch so I can either charge one or the other battery (this is easy part), or use a diode to charge both. The blue and red wires from the 7-pin junction will be disconnected completely from the 7-pin (I have a completely different "charging" plug from TV to trailer that these will be connect to). So, the lift battery gets TV power from the 7-pin and the golf batteries will get 12+ power from the separate plug I have set up.
Question: is there other circuits or wiring runs that would feed the lift battery from the camper?
Hoping a skilled electrician can follow all this….
I'm saying #10 and #14 wires, just taking that from the chart, but not sure the exact size, mainly 10 is bigger than 14.