I've ordered this cable twice now to connect to my Blackboxmycar Powercell battery and nothing works. I tested the output of the battery with a multimeter and the voltage is good. Tested the output cable supplied by Blackboxmycar, the voltage is also good. Used bullet connections and even without (directly) and it does not work. Some comments mention that it was necessary to order at least 3 cables to have one that works. This is my 3rd cable and it still doesn't work. I'm not going to make it to 4. I'm done with them.
Their dashcam are excellent but their hardwiring cables are disaster.