# Truck with burned wire harness (reversed battery polarity)

**URL:** <https://community.cartalk.com/t/truck-with-burned-wire-harness-reversed-battery-polarity/55015>\
**Category:** The Show\
**Created:** [September 12, 2010, 6:34pm UTC](https://community.cartalk.com/t/truck-with-burned-wire-harness-reversed-battery-polarity/55015 "2010-09-12T18:34:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DorJamJr](https://avatars.discourse-cdn.com/v4/letter/d/ce73a5/32.png) [@DorJamJr](https://community.cartalk.com/u/DorJamJr)\
**Post date:** [September 12, 2010, 6:34pm UTC](https://community.cartalk.com/t/truck-with-burned-wire-harness-reversed-battery-polarity/55015/1 "2010-09-12T18:34:47Z")

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Hi Guys,  
  
 I would advise him to disconnect the alternator and try again. He may have damaged the wire harness, but what likely caused the high current was that the alternator diodes became forward biased (and drew LOTS of current) when the battery was connected incorrectly.  
  
 Best regards,  
  
 Jim