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It sounds like you either have a battery that is defective OR perhaps one wired up wrong on the polarity. Or they may have created a short someplace when they were working on it. Start with the easy things first like checking the batteries and cables. Have them load tested as taking a voltage reading won't really give you the answer on the amps capacity. Take a photo of the cables and attach it to your post if you want. All follow ups are included in our fee.
It appears from the first photo that the black lead in loom wrap on the front right battery on the negative post is wrong. I can't tell from that photo if it is a negative or positive lead, so I will take a look at more photos. The main thing is that the leads that tie the two batteries together on each pair from the positive of one to the negative of the other should NOT have any other leads on those posts. Just the series tie cables.
It appears to be a smaller red wire with an inline fuse. Correct? If so, that is a positive lead.
Are the red and white leads on the solar charger (orange) that you can easily see coming from the panels or going to the batteries? Get back to me with some info on those comments are we can go from there.
It makes a difference on which negative you hook it to. You want to hook it up to the SAME negative as the one to the coach. Otherwise you are not getting the correct voltage. Have you checked the solar charger to be sure it is working?
Take a meter and check to see if those are putting out any voltage and it will tell you the polarity. If you see a minus sign you know the polarity is backwards.
Is that the disconnect solenoid or a shortstop breaker. Send me a photo of that.
That is the Auxiliary Start solenoid. It should ONLY come on when you hit the switch for that on the dash. If it is on any other time it is bad or the switch is bad.
Something is wired up wrong I suspect or is that wired up to a BIRD device? Is the engine running then or not?
It controls the charging of the house batteries when the engine is running and comes on when it senses the house batteries need charging. I am wondering if you have one if that is being triggered by the solar charger somehow. I think that is part of the issue here. And I still think that there is some wiring problem in that orange unit if that is the charge controller. Part of the problem is I don't know which wires off that are positive or negative here.
The orange lead should be hooked up where the blue lead is hooked (or was) in your first photo. On the positive feed to the coach. The blue lead should be hooked up to the right rear battery where the negative leads go to the coach. Try that and see if things work better.
Yes, that is all it does.........and that other solenoid shouldn't be clicking unless you hit the switch. That may be a whole other issue.
Or track down the switch and see if that is part of the issue.
Just checking back in to see if you were able to get this resolved or so you still need some additional input from me here?