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After replacing the alternator with a new/used one the engine idles poorly and when the truck is turned off with the keys removed my battery.

Tiny
GIGI74
  • MEMBER
  • 2002 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I replaced the alternator with a used one and now my idle is bad, and when the truck is off with the keys removed my battery light will stay on and run my battery down. What can I do?
Tuesday, August 1st, 2023 AT 7:23 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, it sounds like you have a defective alternator that is allowing the voltage to back feed through it. To be sure disconnect the wiring from the alternator to see if the light goes off. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-replace-an-alternator

Check out the images (below). Please let us know how it goes
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Tuesday, August 1st, 2023 AT 1:43 PM

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