# Chevy Volt Battery Install -\> 2000 GEM 4 seater in San Diego

**URL:** <https://community.electricforum.com/t/chevy-volt-battery-install-2000-gem-4-seater-in-san-diego/17064>\
**Category:** GEM Forum\
**Tags:** lithium\
**Created:** [September 13, 2019, 5:40am UTC](https://community.electricforum.com/t/chevy-volt-battery-install-2000-gem-4-seater-in-san-diego/17064 "2019-09-13T05:40:50Z")\
**Posts on this page:** 1\
**Showing post:** 38

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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:** [October 27, 2019, 10:09pm UTC](https://community.electricforum.com/t/chevy-volt-battery-install-2000-gem-4-seater-in-san-diego/17064/38 "2019-10-27T22:09:51Z")

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![dq%20bms%20interface](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/8/8bdd92c27a0dbb3d9826090c7402f62beabfae57.png)

Any led, 10k, any npn switching transistor.  
Transistor theory:  
Small current through B to E, saturates transistor.  
Current can flow unimpeded from C to E.  
E is B- from bms.  
C is enable line from charger.  
Current path from DQ white wire to B- enables charger.  
No current through led and Base Emitter junction disables charger.

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