I tried to start my 2008 XKR and nothing happened. Not even the horn works. I’ve been driving every day and had no problems not even any gremlins. I opened the trunk with the key and plugged in my battery charger as I do when I know I won’t be driving for a few days. Several hours later there is an amber light blinking and ticking between the inside light buttons. Anybody know what’s going on?? Thanks.