Electrical system shuts off; no lights, no signal light, no air conditioning, etc.

Tiny
DEAN.G
  • MEMBER
  • 2008 LINCOLN MKX
  • 3.5L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
Electrical system cuts off no lights no signal light no air conditioning, no radio, no power windows work, no door locks work, engine runs. I turn the motor off and back on again and all system works and then shuts down in a minute as above.
Friday, August 16th, 2019 AT 11:07 AM

3 Replies

Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Have you had your battery or charging system tested? The electrical system in your vehicle is designed to shed excess amperage draw from accessories when there is a low voltage situation like a weak battery of charging system fault, this is done in order to keep your engine running and get you to your destination.

Here are a couple of guides to help:
https://www.2carpros.com/articles/how-to-replace-a-car-battery https://www.2carpros.com/articles/how-to-check-a-car-alternator https://www.2carpros.com/articles/symptoms-of-a-bad-car-battery
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Friday, August 16th, 2019 AT 11:37 AM
Tiny
JKUNZ22
  • MEMBER
  • 3 POSTS
Did you ever figure it out? I’m having the same issue in my 2012. I tested battery etc. All good. Still having issue. Also the rain sensor I believe is involved because wipers come on all the time.
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Friday, March 6th, 2026 AT 5:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,054 POSTS
Yep, a battery which is shorting out will cause this issue, but I have seen a bad SJB on the right side of the passenger compartment get water damaged and go out as well. I would disconnect the battery and remove the SJB for inspection. The image below is what is looks like. Please let us know what happens. Ken
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Saturday, March 7th, 2026 AT 11:13 AM

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