Is there a constant power source for a car stereo?
Most modern after market car stereos use the same wire colors. Make sure you connect the Yellow wire from the stereo, to the wire you identified as constant power earlier. If you do not locate a constant power source in the vehicles wire bundle, you can route one from the interior fuse box or splice it from a nearby source.
What should I do if my Radio is not powered on?
If the line is not fused already, or there is no fuse in the panel I would suggest getting a cheap inline fuse-holder to splice into the wire. Always fuse hot connections as close as possible to the battery or other DC source.
Why does my stereo keep running when the car is off?
“Memory”, as you correctly guess, provides a constant power to the stereo head that retains presets etc. If you get 0v when the car is off, this is probably incorrectly hooked up to the ACC (Accessory power) instead of constant 12v. Red Wire labeled “ACC” should only have power when ignition is turned to ACC or car is running.
Do you need power line for always on radio?
If your current car has them split out functionally, you may need to wire the always on 12V to your head unit. There are almost certainly two different power lines available to, and likely to be needed by, the radio: Always on. Ignition. The “always on” line always has power available on it.
How to troubleshoot a car stereo that will not power?
Take a close look and make sure no wires are loose entering the harness. Make sure the harnesses are plugged into the car stereo. Trace back wiring from the car stereo’s control head power harness to the fuse block and verify that the wiring is all intact. If you encounter a fuse along the red wire, replace it.
Most modern after market car stereos use the same wire colors. Make sure you connect the Yellow wire from the stereo, to the wire you identified as constant power earlier. If you do not locate a constant power source in the vehicles wire bundle, you can route one from the interior fuse box or splice it from a nearby source.
If your current car has them split out functionally, you may need to wire the always on 12V to your head unit. There are almost certainly two different power lines available to, and likely to be needed by, the radio: Always on. Ignition. The “always on” line always has power available on it.
Why does the radio stay on when the car is off?
This is what would ensure that the settings in the radio stay on when the car is off. If you have connected two power leads to the radio, you may have reversed them. If you only connected one, you probably also need to connect another one that is from a line that is always powered.