# Lights at night

**URL:** <https://community.cartalk.com/t/lights-at-night/6074>\
**Category:** Maintenance/Repairs\
**Created:** [October 17, 2007, 4:55pm UTC](https://community.cartalk.com/t/lights-at-night/6074 "2007-10-17T16:55:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![edrane51](https://avatars.discourse-cdn.com/v4/letter/e/b5ac83/32.png) [@edrane51](https://community.cartalk.com/u/edrane51)\
**Post date:** [October 17, 2007, 4:55pm UTC](https://community.cartalk.com/t/lights-at-night/6074/1 "2007-10-17T16:55:40Z")

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lights work fine during daylight conditions but when headlights are turned on manually or areturned on by low light sensors some turn signals and brake lights do not work properly

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**Author:** ![SteveF](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/stevef/32/2_2.png) [@SteveF](https://community.cartalk.com/u/SteveF)\
**Post date:** [October 17, 2007, 5:38pm UTC](https://community.cartalk.com/t/lights-at-night/6074/2 "2007-10-17T17:38:06Z")

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This initially sounds like a bad grounding problem involving the headlights, however there is not enough information for further diagnosis. For now, make a thorough check of all exterior lighting with headlights off to verify no bulbs are burned out and that all signals cycle normally.

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**Author:** ![Ranck](https://avatars.discourse-cdn.com/v4/letter/r/aca169/32.png) [@Ranck](https://community.cartalk.com/u/Ranck)\
**Post date:** [October 17, 2007, 6:01pm UTC](https://community.cartalk.com/t/lights-at-night/6074/3 "2007-10-17T18:01:03Z")

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Also, check all your fuses. Some running lights might get power back through the headlight circuit when a fuse is blown, but will act strange. Grounding and fuses are the most likely causes for this. Maybe a bad headlight switch or relay could be the culprit.