Hello there. I recently brought the Wide Input Shim to power a Raspberry Pi Zero straight from a 12v car battery. At first glance it seemed to work. When I connect it to the battery (which is currently at 12.4V), it puts out 5.01V between the 5v and ground pin, as you’d expect. However, when I connect that to the Raspberry, it doesn’t boot. And upon further investigation the voltage on the 5V pin drops to 0.54V as soon as I connect the Pi to it. Am I missing something here? Or have a received a faulty shim?
The Pi works and boots fine through usb. The car battery, although old, happily seems to output at least 1.5A on other circuits that I can plug it in to.