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Q: what would cause my car to not start for a week and then just start one day on 2006 Mercedes-Benz E350 4MATIC

drove my down to Dallas from irving and everything was fine. I went to get back into ai after lunch and i would not start, it had plents of Amps but wouldnt turn over, I waited for 3 hours trying on and off before getting it towed, for the last week I would try to start it every morning and today it started, I let it run for a few minutes and drove it around my hotel but im afraid to take it out, any advice?
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. If you turn on the head lights are the lights bright? If not charge and test the battery. Check the voltage across the battery it should be 12.6 volts if the battery is fully charged. Does the engine crank over and rotate the engine if not the starter is not getting power or sufficient power to operate the starter. Try jump starting the vehicle from another vehicle using jumper cables. Another possibility is a problem with the security system but it is impossible to just guess, you need to start properly diagnosing the starting system.
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