# Intrument panel lights flicker at 70 mph

**URL:** <https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590>\
**Category:** Maintenance/Repairs\
**Created:** [August 24, 2007, 5:16pm UTC](https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590 "2007-08-24T17:16:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![monse68](https://avatars.discourse-cdn.com/v4/letter/m/97f17d/32.png) [@monse68](https://community.cartalk.com/u/monse68)\
**Post date:** [August 24, 2007, 5:16pm UTC](https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590/1 "2007-08-24T17:16:49Z")

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I was driving to work this morning on the interstate this morning, and after 30 minutes me battery light and brake light were flickering at speeds 65-75 mph, When I got off the highway and reduced my speed to 55-60 mph this stopped, does anyone know what is going on and how to fix it. Thank you.

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [August 25, 2007, 1:49am UTC](https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590/2 "2007-08-25T01:49:20Z")

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There may be a short or possibly a faulty cable connection.

I’d have a load test done on the charging system with an eye on the alternator and battery.

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**Author:** ![DARTMAN69](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/dartman69/32/29_2.png) [@DARTMAN69](https://community.cartalk.com/u/DARTMAN69)\
**Post date:** [August 25, 2007, 2:03am UTC](https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590/3 "2007-08-25T02:03:06Z")

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I would also check the condition of the belt and tensioner. This problem could be caused by a slipping belt.  
~Michael

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [August 25, 2007, 2:52pm UTC](https://community.cartalk.com/t/intrument-panel-lights-flicker-at-70-mph/3590/4 "2007-08-25T14:52:40Z")

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Those warning lights are in the alternator exciter circuit and when they start doing what you describe it means there is a problem with the alternator internally. Most likely a connection with the brushes is having trouble. Replacing the alternator will take care of this trouble.