I recently did some small electrical work on my 05 300C. I added a unit that has a fused line to the battery and a small keyed wire running to the rear fuse box. Now I have no heat and no antenna. Right off the bat I checked all the fuses in the boxs and only found that the radio fuse was blown. I replaced it and now can’t get the rest fixed. I’ve tried removing the keyed wire to the fuse box and still nothing. Any suggestions would be great.