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Whose chassis do you have here?
On that engine it is located on the rear of the block on the curbside. I would start by load testing the batteries and clean all the cable connections, including the ground lead to the chassis. IF you still need some assistance when you check that, please get back to me. All follow ups are included in our fee.
When you "touch the battery terminals" here what exactly are you doing?
Thought so, but just wanted to be sure. If you are bypassing the start solenoid on the starter then it sounds like that loud "click" is that solenoid and the contacts are probably burnt. That can be purchased separate from the starter, but if this has many miles or years on that and it looks like the OEM starter, you might want to just replace the whole unit.
"To the console" as in the dash? I believe there should be a battery control center under the hood that has some fuses and relays in there. Take a look. Usually on the driver's side.
Did you hit the battery disconnect solenoid switch?
You won't have anything there unless the switch is depressed. There are two solenoids. Are you working with the house or chassis one?
Then you need to be checking the shortstop breakers in the battery control center and see if one is tripped. Use your meter or 12 VDC test light to check for where the power stops. I can add a photo later once I get to my computer.
As I said before......the solenoid energizing leads ONLY have power when the switch is depressed. Maybe time to have a good mobile tech come over and assist you. Hard to do this sort of trouble shooting in this format.
I would contact one or two of the local RV parks and ask them who they would recommend. They usually have one or two they know who can do a good job. I am not sure what you mean when you say "depress the solenoid" here. It has a switch inside.
You are most welcome!