Recent content by lh333_34

Thank you all for your input....It happened that I was following wrong instructions from a webpage saying that the black wire is the ground...and in reality it isn't ! The ground for my car actually is the white/black one! The black is for power antenna. Once the true ground is identified...

My question can be simplified as below diagram shows

Hi everyone I am new in this forum and this is my first thread. Car model: Toyota echo 2004 sedan. I used a multimeter to test the car radio battery wire ( blue/yellow) when it was disconnected from the car radio, its reading was 0v. ( as shown in photo 1 ) before and after ignition, isn't it...