This device (a converter) allows you to run your RV's 12VDC electrical "stuff" and will also charge your RV battery, from a 120VAC supply. This allows the comforts of home without draining the bat or having to run the engine. If the Auxillary duplexs get connected then you can run some ac stuff.
As stated, the 1 and 2 represent the normally open and normally closed contacts of relay 1 and relay 2.
If the Gizmo is NOT plug into 120VAC, then the RVs battery supplies the power to the RVs extra "stuff" through the closed contacts of relay 1 and 2 and the 15 and 7.5 amp fuses. Nothing else is doing anything.
When you plug in the gizmo into a 120 VAC socket
- the transformer is energize.
- the transfo output is rectified and applied to the "electronics board" via wires C and D.
- relays 1 and 2 are energized.
- The normally closed contacts that direct 12v from batt to "stuff" are opened, disconnecting the bat from the loads/fuses.
- the normally open contacts are closed, applying the rectified* power to the loads/fuses,
- As well, the rectified power is applied to the electronics (battery charger) and the bat is charged.
*Since the converter supplies rectified (pulsating) power to its fuses, you cannot use it for sensitive devices that do not have proper filtering.
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Now, your problem.
You have by-passed the relay contacts by shorting the red wires.
The mystery yellow wire needs to be traced back, looks like an add on. Perhaps ground from the bat? hard to see from the pics. If it is power to a device then make sure it's connected to the load side of a fuse.
There appears to be empty spade connectors on the board
- the red wire from the transfo needs to get to the board (the common point of the open contacts)
- the other red wire (from the bat?) also also needs to get to the board (the common point of the closed contacts)
Hard to see from the pics, but make sure you have a box clamp or a protective guard on the hole where the wires come in the back of that unit on the right, to protect from the sharp edges cutting into your bat wire. A clamp can be seen on the left side for the incoming AC
Since someone has been yanking out wires, to avoid any nasty surprises or unneccessary light shows, I would also verify that all the wires agree with the wiring schematic that you have there, before you give it another
flash test
cheers