# Queries on wiring DC Power cord for the LS300 and GX Series

**URL:** <https://forum.sierrawireless.com/t/queries-on-wiring-dc-power-cord-for-the-ls300-and-gx-series/8394>\
**Category:** AirLink routers\
**Created:** [January 27, 2016, 5:20pm UTC](https://forum.sierrawireless.com/t/queries-on-wiring-dc-power-cord-for-the-ls300-and-gx-series/8394 "2016-01-27T17:20:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hwilliams](https://avatars.discourse-cdn.com/v4/letter/h/9dc877/32.png) [@hwilliams](https://forum.sierrawireless.com/u/hwilliams)\
**Post date:** [January 27, 2016, 5:20pm UTC](https://forum.sierrawireless.com/t/queries-on-wiring-dc-power-cord-for-the-ls300-and-gx-series/8394/1 "2016-01-27T17:20:46Z")

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I am still a bit confused on the wiring diagram provided in this forum. The installation guide says the black wire goes to ground, not -12VDC (com). I often get ground and common mixed up, but I believe in most cases they are different, so is pin 2 literally tying to ground (as in chasis ground), as indicated on p.22 of the installation manual, or does pin 2 wire to -12VDC (or com) as the revised wiring diagram (in this forum) is suggesting?

Another question: what potential problems may caused by not grounding the radio chassis? If so, then does pin 2 get attached to this?

😕

Thanks.

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**Author:** ![Moderator1](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@Moderator1](https://forum.sierrawireless.com/u/Moderator1)\
**Post date:** [February 3, 2016, 9:39am UTC](https://forum.sierrawireless.com/t/queries-on-wiring-dc-power-cord-for-the-ls300-and-gx-series/8394/2 "2016-02-03T09:39:56Z")

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Hi,  
Please don’t reply to the FAQ section. If you have any query, post a new topic in the relevant section.

Regards,  
Moderator