If you already have the cable then try this cheap 2000mah mini usb adapter. You need this higher rated one as apple and sat nav products draw more current. I use this 2amp rated plug for my TomTom Go 750 SatNav on my burgman.

http://www.ebay.co.uk/itm/12V-DC-IN-CAR ... 25728f2e02

Are you sure the Belkin charger is a 10W charger?
A lot of car chargers, and phones, only supply/need 5W. The iPhone 4s definitely needs 10W, which might cause the messages?

I got this one, and works fine with my 4s in my car: scooter docent have these fancy gizmos like electricity...

Sh!t
after reading this http://www.belkin.com/uk/IWCatProductPa ... _Id=488682 it looks like its a load of crap. i ought to have checked it out before i bought it.

Never mind, i've just order the one bornagainbiker just posted

bornagainbiker wrote:If you already have the cable then try this cheap 2000mah mini usb adapter. You need this higher rated one as apple and sat nav products draw more current. I use this 2amp rated plug for my TomTom Go 750 SatNav on my burgman.

http://www.ebay.co.uk/itm/12V-DC-IN-CAR ... 25728f2e02

Got this one yesterday matey, and it works a treat