Alternator problem

Tiny
DAVID HUDSON2
  • MEMBER
  • 1994 LINCOLN MARK VIII
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 85,679 MILES
I replaced the battery and the alternator last month. I will be going on my third alternator. The first one was bad from the store and the one I have on the car now I had them test it before I left the store. Most recently I went to visit a friend that lives 2 hours away from me. The car ran fine no problems but once I got there, I turned the car off. Maybe 45 minutes later went to turn the car on the car was dead. Once I got back home I charged the battery and found out the alternator was not working again.

What would cause the alternator to stop working within a month?

Where are to motor to body grounding straps?

What else should I be looking for?

Any help would be great. Thank you
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Monday, July 27th, 2020 AT 1:44 AM

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Tiny
BMDOUBLE
  • EXPERT
Are these alternators Ford Motorcraft brand? If not, I've seen some of my customers replace up to seven aftermarket alternators before they got a good one. just my experience with them. I'm assuming that the last alternator was also tested while on the vehicle? I would start with the basics by verifying that the there is no excess voltage drop in the power wire to the alternator from the battery. Here is a description of alternator tests that can help: https://www.2carpros.com/articles/how-to-check-a-car-alternator
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Monday, July 27th, 2020 AT 8:09 AM

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