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Bad diode

Tiny
TOM411
  • MEMBER
  • 1998 MERCURY SABLE
  • 6 CYL
I've beeb reading that a bad diode reading on a test meter may be the result of dirty battery connections. Could you please tell me if this is true and may there be other causes for this reading besides a bad diode
Thursday, February 10th, 2011 AT 4:07 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
What reading are you referring to? Where are you reading this.
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Thursday, February 10th, 2011 AT 5:52 PM
Tiny
TOM411
  • MEMBER
  • 3 POSTS
It was in eHow. Testing the alternator diodes. When I took the car to auto zone the tech put an auto mart test meter on the battery he said the alt was putting out 14 volts but showed a bad diode
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Thursday, February 10th, 2011 AT 6:11 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
If the test says it has a bad diode, then it has a bad diode and it needs a new alternator. This can cause the alternator to draw your battery down when parked.
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Thursday, February 10th, 2011 AT 6:18 PM
Tiny
TOM411
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Is replacing the alternator something I can take on myself or do I need a professional. And THANKYOU WRENCHTECH for helping me today
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Thursday, February 10th, 2011 AT 6:38 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
I have no idea of the extent of you knowledge, ability or tools so that's not a question I can answer.
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Thursday, February 10th, 2011 AT 6:41 PM

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