I was cleaning my pilot this past weekend and a couple days ago I tried driving it and when I turned the key in the ignition absolutely nothing happened, no noise, no lights, no clicking. I tried jumping it with an external jumping kit, nothing happened. I took the battery out and put it on an external charger. It read 13.1V 3.1A and 75% charge and the battery was very recently bought so it is not a battery issue. I put the battery back in the pilot and still same issue, I read the voltage on the battery while connected and it was around 5.4V, very low. As soon as I took it off it read 11.1V. So I went around the pilot and checked EVERY fuse with a multimeter, all of them are good. So I started pulling fuses one by one and reached the BACKUP ACC fuse. When I pulled it out the voltage shot up to about 9V but was fluctuating. I further went on removing fuses and got to the RADIO fuse, when I pulled that, it stopped fluctuating and went up to 11.8V. The pilot would still not start, same issue (tried jumping with the 11.8V too). Then I noticed that when I put on the hazards, there was a clicking sound near the driver fuse box, it sounds like it’s coming from the grey box inside the driver side fuse box. However, I can’t get the grey box open. Any ideas?