Connecting PSU (pc) to amp with lighted switch resulting in failure. Is common ground problem? Answered
Using a desktop psu to power a speaker amp. Have tested and it works fine. I wanted to add a lighted switch. The plan was to attach it to the green-to-ground short that turns on the psu, then attach the "everything's ok" grey wire with it's +5Vdc. This doesn't work, not sure why but it doesn't output the 5 volts I expected. I tested the light with the "standby" purple wire, this proved the light worked at 5 volts and that it was functional. I didn't want the light just 'always on' since there's no point in having it lit then. I tried attaching various 5V red wires and grounds but found that in all combinations the amp's power indicator light and the switch's light would each dim then quickly relight then dim.....repeatedly. I can only assume the light is not using a sufficient amount of power and may be causing a short. Since all black wires and the case are common ground I believe there is no solution to attaching the switch to the psu directly while also lighting it.
The switch is the 3-pronged variety with power | load (light) | ground
The amp requires a ground, 12 Vdc, and a remote which is actually 12 Vdc also (I have just shorted them and turn the power supply on/off instead as I'm not sure if the amp draws much power when the remote is off/disconnected.