1999 Mercury Sable Car runs battery down and shuts off whil

Tiny
WALTERGE2
  • MEMBER
  • 1999 MERCURY SABLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 105,000 MILES
I replaced the alternator and battery in my car after the battery light came on and my car shut down while driving. It was characteristic of a bad alternator. Howerver, the problem continued after I replaced the alternator with a brand new one. Is there anything else that can cause this problem?
Monday, August 23rd, 2010 AT 7:14 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Have you tested the charging voltage with the alternator in the car? If not, you need o do that first and post the results.
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Monday, August 23rd, 2010 AT 7:56 AM
Tiny
WALTERGE2
  • MEMBER
  • 2 POSTS
The voltage at the battery terminals is no different when the car is on than when it is off. I took the alternator for a bench test and the alternator and voltage regulator both tested out fine. I checked all fuses and they are OK also.
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Tuesday, August 24th, 2010 AT 7:40 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I seriously doubt that to be true. You have proven that the alternator works on the bench when the proper power supplies are put to it, yet it does not when in your car.
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Tuesday, August 24th, 2010 AT 10:50 AM

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