General Electrical Problem...questions about testing
The diesel is my first vehicle with 2 batteries, so I want to make sure I'm not screwing up my readings and coming to the wrong conclusions.
I have been having a problem with the batteries dying. I think it is from the stereo (2 amps, 1 speaker, 1 sub amp, all 'professionally' installed). The weird thing is that the problem is recent and the stereo has been in for almost a year.
Do I need to isolate one battery to check for amp draw with a meter? The stereo is fed from the driver (aux) battery with 1/0 cable through a 150A fuse to a distribution block to 4ga to each amp. Disconnecting the main amplifier cable and inserting the meter, I get about a 1.6A draw with the truck completely off and the key out. This seems wrong to me.
I took it to the stereo shop and they told me it isn't the stereo. He told me they checked the stereo with one battery disconnected and it is fine, but I am getting a draw somewhere that stops when they pull fuse 22 in the hood box (a 50A maxi) that the owners manual says is the junction box fuse. I am guessing this is the main battery feed to the junction box, so that doesn't really isolate anything.
I am pulling my hair out because I don't trust driving the truck anywhere.
I guess my main question is do I need to isolate one battery to test amp draw by pulling fuses?