# I.D. Wires On The H4 Socket Connector? **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 7, 2013, 6:04am UTC](https://community.cartalk.com/t/i-d-wires-on-the-h4-socket-connector/79790 "2013-06-07T06:04:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Schooner](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@Schooner](https://community.cartalk.com/u/Schooner)\ **Post date:** [June 7, 2013, 6:04am UTC](https://community.cartalk.com/t/i-d-wires-on-the-h4-socket-connector/79790/1 "2013-06-07T06:04:34Z")
_Hi Guys_ Bought a H4 Socket Connector which has three (3) colored wires I.e. Black I know is: Ground. However, the two (2) others; Yellow & Green. Questions: What is the Yellow? and what is the Green wire use for? ---
**Author:** ![RemcoW](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/remcow/32/2471_2.png) [@RemcoW](https://community.cartalk.com/u/RemcoW)\ **Post date:** [June 7, 2013, 7:26am UTC](https://community.cartalk.com/t/i-d-wires-on-the-h4-socket-connector/79790/2 "2013-06-07T07:26:50Z")
I replaced one just the other day on my son’s car. I just went wire by wire. Google is our friend: [http://blog.modifystreet.com/h4-h13-9004-9007-common-bi-xenon-hid-kit-problems-highlow-beam-reverse/h4-9003-hb2-hid-plug-pin-polarity-pattern/](http://blog.modifystreet.com/h4-h13-9004-9007-common-bi-xenon-hid-kit-problems-highlow-beam-reverse/h4-9003-hb2-hid-plug-pin-polarity-pattern/) ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [June 8, 2013, 5:30am UTC](https://community.cartalk.com/t/i-d-wires-on-the-h4-socket-connector/79790/3 "2013-06-08T05:30:59Z")
Don’t assume black is ground…use a VOM (Volt-Ohm-Meter) to determine which wire is which…