Here is something I would do when it was really cold out to start my 240.I would first turn the key to kII and wait a few seconds. All the dash lights on waiting maybe 5-10 seconds. From there I would turn to kIII and the car always started with no problems. I theorized that i the first few seconds the cables were being warmed by the battery current and that after that short spell the curent would flow easier/faster to start the car. This may sound crazy to some. My neighbor asked me why my car always started in the bitter cold and his 240 did not I told him my secret. He tried it and never had a problem with winter starting. Doesn't cost you anything to try. But do make sure you don't have a battery drain somewhere like your power door locks.