This has got me foxed. For using with phone and intercom, I Installed an auxilliary power socket (cig light type) under the seat, tapping into the tail-light power supply. It all checked out ok with a borrowed multimeter, and still does - 11.8a. But putting the phone charger into it, there is nothing happening at the phone, doesn't light up the LED in the charger. Same with intercom charger. Borrowed a GPS - same again. Nothing at the charger(s). I tried a socket double adapter in case there was something wrong with the contact points inside the plug, and I got power at the end of the adaptor. Double checked chargers and power supply - all ok. What have I done wrong?