My 4 year old battery has been sitting, not charging, for nearly 5 months. I have a new battery purchased to replace it, hoping to do that before what is happening happened. Dumb. So now I plug the ...
And even when connected to truck..truck will NOT charge a very low/dead trailer battery. Truck charge line is really for maintaining charge on battery while in transit.
Now you could use jumper cables from truck battery to trailer battery but that will also require time.
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