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Before I make the phone chat offer for you..........what is the model number on the data tag of the new water heater? I think that part number you gave me is just for the control board.
The data tag should be visible when you have the door open or off on the right side or bottom.
The door on the water heater which is probably off right now.........look below the control board on that side.
Not the model number...........it will be below the control board and to the right of the burner.
Or just take a photo of the front and I can tell from that...........
That is a Suburban 6 gallon water heater with A/C element. I will add a copy of the Suburban water heater manual for you. See the wiring diagrams and also the one in the first photo you sent. See the wiring diagrams in there. If you still need a phone chat we can do that. http://bryantrv.com/docs2/docs/subsw.pdf
Does that give you what you needed? Red is the incoming 12 VDC feed. Yellow is the ground lead. Blue is for the light on the switch. It comes on when the board goes into ignition and off when it ignites. You will need the #12 cable for the AC side and a switch unless the old one had AC as well. I think on that older model the AC will be on the rear (if it has that).
I don't think this will work unless you do a phone call.........I can't tell from the photo what incoming wiring you have.
You need a positive lead to hook up to the red lead and a negative lead to hook up the yellow lead to and blue goes to the switch light. The red goes to the positive side of the switch. You need that to hook this up. And no, I can't call you as that would be against the site rule and I don't make them. Sorry!
That is a ground lead and that is why it is hooked up to the white wire. IT and the yellow lead do the same thing really.
If you look at the diagram, both of them are ground leads. One goes up to the switch and one grounds to the chassis someplace. You could hook it up to the ground lead on the pump. That is a black lead.
No..........it has to power the light on the switch.
You will need to get that part............
I think you need to have a mobile tech come over and assist you...........and I have to leave for the evening so I will opt of this and allow another tech to assist you.