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Did you check the fuses under the hood? there are some long integrated fuse assemblies that have either a blue or brown top, they're about 1/4" wide, there are many segments inside these fuse link assemblies and it sounds like some may be blown out, which is what usually hppens if the battery was connecvted backwards or otherwise shorted out, these are not easy to replace as the fuse box has to be disassembled to remove and replace them.
Unless you have some tools and are able to take the fuse box apart to remove the bolts that hod the fuses in, my advice would be to do so.