# 2007 Chevrolet Impala - Lights dim

**URL:** <https://community.cartalk.com/t/2007-chevrolet-impala-lights-dim/140302>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [May 14, 2019, 7:58am UTC](https://community.cartalk.com/t/2007-chevrolet-impala-lights-dim/140302 "2019-05-14T07:58:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![KevinWestmoreland](https://avatars.discourse-cdn.com/v4/letter/k/fbc32d/32.png) [@KevinWestmoreland](https://community.cartalk.com/u/KevinWestmoreland)\
**Post date:** [May 14, 2019, 7:58am UTC](https://community.cartalk.com/t/2007-chevrolet-impala-lights-dim/140302/1 "2019-05-14T07:58:51Z")

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On deceleration, the engine rpm goes up and down causing the headlights to dim accordingly. This happens at lower than 35 mph speeds. Once it down shifts, the lights and engine operate normally. The car has 267,000 miles on it Most of them highway and still getting about 30 mpg.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [May 14, 2019, 12:38pm UTC](https://community.cartalk.com/t/2007-chevrolet-impala-lights-dim/140302/2 "2019-05-14T12:38:12Z")

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Have your alternator checked. What you describe shouldn’t happen.