# Why does my F-150 lights flicker, wont shift out of park and lights mess up the ac?

**URL:** <https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831>\
**Category:** Maintenance/Repairs\
**Tags:** f-150, ford, lights\
**Created:** [November 22, 2021, 11:45pm UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831 "2021-11-22T23:45:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![gacek3054\_178277](https://avatars.discourse-cdn.com/v4/letter/g/90db22/32.png) [@gacek3054\_178277](https://community.cartalk.com/u/gacek3054_178277)\
**Post date:** [November 22, 2021, 11:45pm UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831/1 "2021-11-22T23:45:48Z")

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Does anyone know why the light are flickering, won’t shift out of park and the lights are messing with the ac and heating

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**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\
**Post date:** [November 23, 2021, 12:00am UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831/2 "2021-11-23T00:00:16Z")

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What year? My 03 250 was funky if steering wheel was tilted all the way down

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [November 23, 2021, 12:02am UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831/3 "2021-11-23T00:02:17Z")

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what year is your truck?  
what lights?  
do you have a check engine light on? if so what is the code?  
the more you tell us the better, so we can try and help.

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**Author:** ![SteveCBT](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/stevecbt/32/3192_2.png) [@SteveCBT](https://community.cartalk.com/u/SteveCBT)\
**Post date:** [November 23, 2021, 1:23am UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831/4 "2021-11-23T01:23:17Z")

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Put a volt meter on the battery, engine not running it should be ~12.5+ volts, running it should be 13+. Low voltage can cause weird things to happen.

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**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\
**Post date:** [November 23, 2021, 2:29am UTC](https://community.cartalk.com/t/why-does-my-f-150-lights-flicker-wont-shift-out-of-park-and-lights-mess-up-the-ac/180831/5 "2021-11-23T02:29:27Z")

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Could be bad battery connections or a failing alternator. Those would be my first guesses.