OK, this required emergency repair. I mean, you can’t drive without properly operating subwoofers!
So, last few days I could smell lifht burning smell in BMW. First I thought I damaged some plastic piece and it is making contact with tires. Nope. Checked amplifiers (I have two), nope. Anyway, last night I checked battery and found this:
View attachment 287534
Melted inline fuse for amplifier that is pushing two under seat subwoofers (8” each). Amplifier is monoblock JL Audio 500W.
Not sure what is cause. My best bet is corroded wires (4AWG) since they are 5yrs old or due to vibrations, connection got loose at fuse point and created more resistance. Weird part, subwoofers were working normally.
OK, new fuse and cable (red tape on fuse):
View attachment 287535
Connected to amp:
View attachment 287536
In next few days I will put new cable for other amplifier that is pushing regular speakers (blue tape fuse):
View attachment 287537
Everything was done in an hour. No more smell, no any kind of heat emitting from fuse or cable.
This is how two amplifiers are connected to battery: