# Swap T3 to a t4

**URL:** https://community.electricforum.com/t/swap-t3-to-a-t4/17781
**Category:** GEM Forum
**Created:** [December 30, 2019, 11:22pm UTC](https://community.electricforum.com/t/swap-t3-to-a-t4/17781 "2019-12-30T23:22:55Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![Gem\_e2](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/gem_e2/32/1849_2.png) [@Gem\_e2](https://community.electricforum.com/u/Gem_e2)
#### Post date: [January 3, 2020, 4:03pm UTC](https://community.electricforum.com/t/swap-t3-to-a-t4/17781/5 "2020-01-03T16:03:22Z")

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Hi  
it connect pin13 from controller to -72v negative with a relay  
and also fix so you can not drive with handbrake

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