Join Date: Sep 2007
Location: Roseburg,OR - Tujunga (LA), CA
Thanked 32 Times in 23 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It wil help if when asking a question or requesting advice, to ALWAYS state the model (450-451). This is particularly important because the people who are most knowledgeable of the 450 aren't usually as knowledgeable on the 451 and vise versa.
If the battery is dead dead, and the car is locked, you will need to open it with the key, 451-left door, 450-tailgate.
A trickle charger will not blowup a battery ( even if it is frozen) and a battery, in a garage, in a car, at 20degree's is not going to freeze.
An auto, even one that can be 'roll started' ( Mercedes term), that has an alternator, cannot be roll started with a dead battery (alternator- electro-magnetic field Generator- permanent magnetic field). Plus because of the computer's need for power.
I would recommend a trickle (1-2 amp) charge for several hours minimum.
It should then have enough power to enable a roll start.
BTW: If your radio has been set to "Safe", you will need to reenter the code.
To remove the radio always set it to 'Code' first. this is also true when ever disconnecting the battery, resetting the computer to a new primary driver.