Need to test car stereo

[Oakey]

I have two headunits I need to test, preferably without ripping the current stereo out of the car and plugging it into that.

Can I wire it up to a spare molex connector on a PC PSU?

[Stickyfinger]

Use a (the) 12v car battery, ZERO interference

[Meoricin]

You can, I tested & updated the firmware on my current head unit that way.

[Oakey]

Yep, all sorted. Wanted to make sure it all powered up