Many warning lights?

2012 JEEP GRAND CHEROKEE
80,000 MILES • 5.8L • AUTOMATIC
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TGOURASH
  • MEMBER
  • 1 POST
Took the Jeep to have brakes replaced. Then it would t start bc they left the.ignition on and drained the battery. They tried to fast charge it, no good. The next day replaced the battery. Now the brake switch is bad and won’t work , have to use the key. They replaced the brake pedal switch and now it starts with the button and brake pedal. After driving about 1 mile, about 6-7 Light are on, the dashboard is lit up. Please help. Really don’t want to take it back there.u
Jul 1, 2026 at 6:58 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Yep, I hear ya. The first thing I would do is check the alternator with the engine running, this video can help you.

https://www.youtube.com/watch?v=Z-p4dMJUpUw

If the alternator is not working it will cause the problem you are describing. You might have had a voltage surge when connecting the new battery which can cause the alternator to go out, this is the first test to see what is going on, also are the warning lights on when you first drive it or just when you have driven it for a while? Please go over this video and get back to me.

Jul 2, 2026 at 2:14 PM
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