I have a Mercedes Sl350 (2003). Both batteries were replaced around 6 months ago although vehicle has not been used for a while (Say 3 Months).
There is no power to vehicle whatsoever. RAC said the starter battery under bonnet shows over 12V but unable to start vehicle, Just had Specialist key company out and they said both my keys should work as they can read the data etc. I'm Unable to access the boot - not even with blade key ! - jammed shut. Wanted to check battery in boot. Any Ideas ?