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Battery I grabbed was backwards?

Tiny
MOOSEFBALL09
  • MEMBER
  • 2000 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 124,000 MILES
I hooked a different battery up to my truck to start it while the origanal was charging and I didn't relize that thhe battery I grabbed was backwards. I accidently hooked the negative to the positive and the positive to the negative. Now the batteries won't hold a charge and we tested the altenator and it's good what could be wrong? Thanks!
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Saturday, December 8th, 2007 AT 1:31 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Welcome to 2carpros

You short circuited the battey-might also want to have the alternator load tested to make sure its putting out and inspect the fusible links.
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Saturday, December 8th, 2007 AT 1:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
When you connect the batteries backward it can short the battery out internally and it will need to be replaced. Here is a guide to help you fix anything else that might be wrong.

https://www.2carpros.com/articles/resolving-reverse-battery-connection-in-cars-a-step-by-step-repair-guide

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Saturday, July 20th, 2024 AT 6:54 PM

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