SailMonkey brings up a good point regarding polarity
, and explains why a fan would spin but a trafo mau struggle - there's also another option worth checking:
What's the rated current
output of your 12VDC socket? some have current
limiters built in them to prevent free-discharge in the event of a short. You'll need a reasonable minimum of 500mA to feed an iPhone
charger @ 12V.
The actual iPhone has a 3.7V 1150mAh (1400mAh max cap) battery. The required supply down the USB cable is 1000mAh @ 5VDC for optimal charging
. The 'charging' icon will flash on with as little as 500mAh, but the battery will struggle to charge from near-empty, so nearer 1000mAh is preferable.. most USB sockets (on laptops etc) can handle this. It's worth checking to make sure the 12VDC side of your charger is providing the current supply necessary for the charger to operate correctly.
Hope this helps!
p.s. It's a fair ol' drive from Dallas area to the gulf.. are you that hardcore or do you also take advantage of the fresh water
in the area?