1999 Ford Mustang Electrical Failure

FORD MUSTANG
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JDD555
  • MEMBER
  • 2 POSTS
my car is a 1999 mustang
3.6 liter

my wipers and stereo wont work when the key is on power but will work when its on aux power..my car was used to boost a semi. after that my whole electrical system is not working correctly.my door locks dontlock my power windows dont roll down .
Apr 17, 2007 at 3:52 PM
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BESTBET777
  • ✓Experienced Mechanic
  • 89 POSTS
If you used your batttery tto boost a battery of much more thhan 100 amps/standard car batttery, you probably damaged your batttery andn possibly otther electronics. Start by getting your battery tested at a parts store, then plug in a test computer.



[quote:7e00e80340="Jdd555"]my car is a 1999 mustang
3.6 liter

my wipers and stereo wont work when the key is on power but will work when its on aux power..my car was used to boost a semi. after that my whole electrical system is not working correctly.my door locks dontlock my power windows dont roll down .[/quote:7e00e80340]
Apr 17, 2007 at 7:50 PM
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JDD555
  • MEMBER
  • 2 POSTS
I bought a brand-new battery already. didnt fix it.
Apr 18, 2007 at 4:31 AM
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BESTBET777
  • ✓Experienced Mechanic
  • 89 POSTS
You need to test the who0le system and fix everytthing at the same time, you can't do it piece meal, your new battery is probably being ruined as we speak.
Apr 18, 2007 at 6:04 AM

Suggested Repair

Have the battery and the entire electrical system tested together with a scan tool. Do not repair items one at a time, because an ongoing electrical fault may be damaging the new battery after the car was used to jump-start a much larger truck battery.

Conversation Summary

The owner of a 1999 Ford Mustang reports that the wipers, stereo, door locks, and power windows stopped working correctly after the car was used to boost a semi. The wipers and stereo work in accessory power but not with the key on. A new battery did not fix the problem. The expert says boosting a much larger battery may have damaged the battery and other electronics, and advises testing the whole system at once rather than piecemeal.

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