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

2008 LINCOLN MKX
135,000 MILES • 3.5L • 6 CYL • 4WD • AUTOMATIC
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DEAN.G
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  • 1 POST
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.
Aug 16, 2019 at 11:07 AM
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BMDOUBLE
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  • 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
Aug 16, 2019 at 11:37 AM
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JKUNZ22
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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.
Mar 6, 2026 at 5:35 PM
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JKUNZ22
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Did you ever figure it out? I’m having the same issue in my 2012.
Mar 6, 2026 at 5:35 PM
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STRAILER
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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
Image (Click to enlarge)
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Mar 7, 2026 at 11:13 AM