When I try to connect it to the car, the cord isn't supplying power so it dies right away.
Perhaps the following links provides a solution for you
Connecting iPod to your homen or car stereo auxiliary input sing the headphone jack:
https://support.apple.com/en-us/HT201687
Get help using your iPhone, iPad, or iPod touch with your car stereo:
https://support.apple.com/nl-nl/HT203412
>> scroll to iPod out is not supported over the Lichtning to 30-pin Adapter.
You should still be able to navigate and play your music using the vehicle's built-in user interface.
AT&T car charger apple 30 pins
http://www.att.com/chargers/att-car-charger-with-usb-port-2-amp-apple-30-pin.htm l
Belkin MicroCharge >> scroll to Compatibility
http://store.apple.com/us/product/H2655VC/A/belkin-microcharge-21-plus-charge-sy nc?fnode=74