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1999 Mercury Marquis Battery light always comes on

Tiny
PAUG
  • MEMBER
  • 1999 MERCURY MARQUIS
Electrical problem
1999 Mercury Marquis V8 Automatic 108000 miles

Ever since I bought my car I have had electrical problems. One week after purchasing my car the battery light would constantly come and I had the alternator replaced. This did not solve the problem. Since then the car has sometimes lost total power - the radio goes dead, then the headlights go off, then the car dies. The battery has since been replaced, and a second alternator put in. Still, the battery light comes on, stays on for up to 15 minutes at a time, then goes off. When the battery light is off the car runs perfectly. When the battery light is on the A/C stops working but the car is still drivable. What could the problem be?
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Friday, October 10th, 2008 AT 9:30 AM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check fuse no.2 30amp and fuse no.15 10amp-See below


https://www.2carpros.com/forum/automotive_pictures/12900_alty_29.jpg

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Friday, October 10th, 2008 AT 9:40 AM
Tiny
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I will check these 2 fuses tonight - but assuming these fuses are not blown, what does it mean?
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Friday, October 10th, 2008 AT 9:42 AM
Tiny
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You track the charging circuit from the ignition switch to the alternator
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Friday, October 10th, 2008 AT 9:44 AM
Tiny
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Where can I get a larger image of the charging system diagram?
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Friday, October 10th, 2008 AT 9:44 AM
Tiny
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Give me your email addy
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Friday, October 10th, 2008 AT 9:45 AM

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