I took the battery cables off one at a time on my 07 Beaver Marquis. Three batteries. Cleaned and tested each battery separately. Had the battery switches off. Now I have no power anywhere that is connected to the chassis batteries. Checked 5 engine fuzes in back panel of engine and all are ok. Any id as guys? Can't imagine what I did? Thanks in advance for any assistance.
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I did something similar this spring. I had your symptoms. Before putting the 3 batteries back in, I tucked the battery cables out of the way and then sanded and painted the battery tray.
When I reconnected the two motorhome 12V batteries back, I made sure that I had one ground cable going to the two battery negative ground posts. I made sure that I had the 2 positive post connected together and one positive cable going off to the motorhome. What I missed was the OTHER heavy positive cable going off to the motorhome. That cable was still dangling behind the battery tray box.
So my point is… Check your connections again. Make sure that all of your cables are terminated properly. Look under the motorhome to see if you forgot that one cable.