2007 Mercury Monterey car wont start

Tiny
MIGSELECTRIC
  • MEMBER
  • 2007 MERCURY MONTEREY
  • 180,000 MILES
Was missing real bad. Shut off on me, and now wont start. Checked starter and its fine. Engine does turn manually. When u try to start the instrament panel lights up but w3hen u turn it everything goes dead. Ther is also a bumping sound when key is on.
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Monday, September 2nd, 2013 AT 11:39 AM

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Tiny
CARADIODOC
  • EXPERT
What you're describing is typical of a failed charging system. Start by measuring the battery voltage. If you find 12.6 volts it is fully-charged and we'll have to look for a bad connection. If it's closer to 12.2 volts, the battery is good but discharged. Charge the battery at a slow rate, then have the charging system tested. If you find around 11 volts, the battery has a shorted cell and must be replaced.
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Monday, September 2nd, 2013 AT 12:15 PM
Tiny
MIGSELECTRIC
  • MEMBER
Battery is good. Something else must b wrong. Maybe main computer? Not sure.
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Monday, September 2nd, 2013 AT 12:43 PM
Tiny
CARADIODOC
  • EXPERT
What is the battery voltage?
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Monday, September 2nd, 2013 AT 1:00 PM
Tiny
MIGSELECTRIC
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Battery is good.I Something else must b wrong. Maybe main computer? Not sure. 12.47. Inside the fuse panel some read 12.47 and some read 147.
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Monday, September 2nd, 2013 AT 1:04 PM
Tiny
MIGSELECTRIC
  • MEMBER
When ichecked at battery it was 12.47. Inside the fuse box its reading 12.47 in some places and 147.0 in other spots.
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Monday, September 2nd, 2013 AT 1:07 PM
Tiny
CARADIODOC
  • EXPERT
12.47 is not good. It will be 12.6 volts if the battery is fully-charged. This does not, however, point to a failed charging system. The next thing is to measure the battery voltage again while a helper tries to crank the engine. It must not drop to less then 9.6 volts. Measure that right on the battery posts, not the cable clamps. If it stays above 9.6 volts, remember the value, then measure again with your meter probes right on the two cable clamps. If it's lower there, one of them has a high-resistance connection and should be cleaned and tightened. If you get the same voltage, move your meter probes down the line and repeat the test. In particular look at the smaller positive battery wire where it bolts to the under-hood fuse box, and the smaller negative wire where it bolts to the body. Those are a common source of electrical problems.
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Monday, September 2nd, 2013 AT 1:12 PM
Tiny
CARADIODOC
  • EXPERT
Are you using an auto-ranging meter?
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Monday, September 2nd, 2013 AT 1:15 PM

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