, I got this for my caravan. I have two 12 volt batteries. This charger works great. A blue light indicates that charging is in progress. And it's waterproof. I bolted the charger to my trailer using the two factory holes. I then cut the battery clips off the end of the cable and make connections to attach them to the positive and negative battery terminals. That way I still have a 2-pin connector that I can unplug if needed. If the blue light does not come on, the positive and negative cables are connected to the wrong battery post.
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