Just as a follow-up - in case anyone is curious, my trailer didnt have a cutoff switch for the tongue battery. As prof suggested, the previous owner had modified the connection when he (or someone) installed the solar panel. Then, they reversed the connection so that the black wire has to go to positive and white to negative. So, I had to locate the inline fuse he installed which was blown as I hooked it up with black to negative. Anyway, problem solved. Thanks for the help.
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