USB voltage drop when engine is running

Technical V 100
1

Any ideas for why the voltage from the USB port should actually decrease when the V100 engine is running?

The symptom is that the Quadlock wireless charger either flashes its light (QL says this indicates supply voltage problems or other fault) or plain shuts down with the engine running but works fine to charge an iPhone with the ignition on, engine off. A direct USB to Lightning cable charges the phone in both cases. Tested with two different chargers.

2

have you also tested the quadlock charger with different cables?

1 Like
3

Yes, several cables. Even built a direct connection into the wiring between the USB socket and its connector to the wiring loom. Same results. Driven from a mains USB charger, the Quadlock never fails to magnetically charge my phone.