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Old 11-16-2013, 12:04 PM
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vstech vstech is offline
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,386
Originally Posted by cornemuse View Post
I have a little number that you snap on a 9v battery on one end (like in smoke alarms) & then plug into the cig lighter. Works on cars that have cig lighter ALWAYS hot. 9v is enough to save radio settings.
that'd work if you have an always hot 12v socket installed in the car... but it would not work on a stock benz, because the electrical system would suck the battery dry almost instantly...
you could use a clamp on 12v socket connected between the body of the car, and the glow plug relay lead (it's hot all the time) or the starter lead if that's easier to reach... the large wire on the alternator lead would work also...
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