Battery keeps draining flat

2001 FORD EXPEDITION
211,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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JPDTHR3E
  • MEMBER
  • 1 POST
Installed new battery, and new alternator because it was draining. drove very little the day i fixed.so was parked 2 days got in went to store everything is fine come home parked for 5 hours and it's completely dead.it will jump off but i have no electric nowhere.what else could it be?
Aug 29, 2020 at 4:02 AM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
When you changed the alternator, did it come with a new regulator or did you have to swap it over? They are removable so if you have to swap it over then we need to replace that to start.

Next we need to test the actual out put of the alternator and make sure the new one is a good part. Here is a guide on how to do that or most parts stores will test them for you:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

The next thing to check is to make sure the belt is tight. If it is too loose then it can cause an issue with the alternator basically slipping.

Let's start with this and go from there.
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Aug 29, 2020 at 12:15 PM
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