Air suspesion problems

[skookumchuck]

My airbags in my 2016 f15 x5 were constantly going down so I replaced them plus it was always blowning the 40amp fuse. I thought the compressor was at fault so i replaced that. The fuse dosen't blow now but the compressor is not getting power to it to work. I manually got the compressor electrical plug, attacched a couple of wires to a batterty to blow up the airbags and thats lasted for a couple of week but they are starting to go down ever so slightly day by day. I'm at a loss as too why i can't get power to the compressor. any ideas ??