# Harness BMS for 12s+6s+6s

**URL:** <https://community.electricforum.com/t/harness-bms-for-12s-6s-6s/14130>\
**Category:** Battery & Chargers\
**Created:** [July 19, 2018, 9:32pm UTC](https://community.electricforum.com/t/harness-bms-for-12s-6s-6s/14130 "2018-07-19T21:32:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [July 19, 2018, 9:32pm UTC](https://community.electricforum.com/t/harness-bms-for-12s-6s-6s/14130/1 "2018-07-19T21:32:31Z")

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@diymatt  
When building any harness, I need to know the battery order.  
This is my test batteries connected B-^12s^6s^6s^B+  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/7/767d977c9b898a3a699a178f9cbc8e54982d6f6b.jpg)  
Plugs will be marked B-^blk^blue^red^B+.  
Even though they are tested here, it’s up to you to test voltages at jst-xh plugs to bms before connecting the bms end. It is one last check to make sure we understand each other.