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You wait.... and then reinstall the radio code. The radio must stay on during the wait.
We use a small motorcycle battery... actually I think our current battery is a replacement for the ones in the "Jump box" we use.
I don't like hooking to the battery cables as it's just too easy to lose the contact while manuvering the battery. We use a special tool from MB's connector break out box assortment 220 589 00 99 00. It looks like an 80a maxifuse but the top has the same round connector receivers as most electrical devices (DVOM, DSO). We jump the device with a connector having a large fuse and replace the term 30 maxi fuse with the device and then hook up the small battery.
I would not advise using the cigarette lighter as the only way to do it would be with the key on. It then needs to power every circuit that works through the lighter wiring. It isn't too hard to imagine the load taking out the fuse and then you've lost everything and at the same time disconnected the battery with the key on; a not so nice event. Take the key out whenever doing any of these techniques.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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