# High Pitch sound when headlights on

**URL:** <https://community.cartalk.com/t/high-pitch-sound-when-headlights-on/21692>\
**Category:** Maintenance/Repairs\
**Created:** [November 5, 2008, 11:50pm UTC](https://community.cartalk.com/t/high-pitch-sound-when-headlights-on/21692 "2008-11-05T23:50:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jhuredhead](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/jhuredhead/32/1027_2.png) [@jhuredhead](https://community.cartalk.com/u/jhuredhead)\
**Post date:** [November 5, 2008, 11:50pm UTC](https://community.cartalk.com/t/high-pitch-sound-when-headlights-on/21692/1 "2008-11-05T23:50:12Z")

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I own a small all-electric car; Kurrent.  
  
  
  
 When I turn on the running-head lights-rear lights for night driving the speedometer now doesn’t light up and is making a high pitch monotone sound. The radio flashes pulses but does not come on when the headlights switch is turned on. A crossed circuit wire or switch?  
  
  
  
 My car is very basic assembly.  
  
  
  
 Also one rear light is brighter than the other when I press on the brake pad. When the lights are on for night driving only one side illuminates brighter when I step on the brake.  
  
  
  
 Thought I’d ask you. THANKS, jay  
  
  
  
 [http://www…D8F0a2rqn0](http://www.youtube.com/watch?v=uD8F0a2rqn0)

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [November 6, 2008, 12:16pm UTC](https://community.cartalk.com/t/high-pitch-sound-when-headlights-on/21692/2 "2008-11-06T12:16:46Z")

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Replace the rear combination bulbs (brake - tail) lights. That is part of your problem. I would guess the rest of your problem (I doubt if replacing the lamps will fix everything, but maybe) is a bad connection, likely a ground wire not making good contact.