# 2000 GMC 1500, is there an unswitched hot between the cab and the bumper?

**URL:** <https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798>\
**Category:** Factual Questions\
**Created:** [June 26, 2018, 9:09pm UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798 "2018-06-26T21:09:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![cornflakes](https://avatars.discourse-cdn.com/v4/letter/c/9d8465/32.png) [@cornflakes](https://boards.straightdope.com/u/cornflakes)\
**Post date:** [June 26, 2018, 9:09pm UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798/1 "2018-06-26T21:09:06Z")

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Arcane question, but the title says it all. I want to install a 12V port in the bed to use occasionally. I know that the pinout for a 7-pin RV connector has 12V auxillary power on one of the pins, but this truck has a round 4 pin trailer connector.

If there isn’t one, then I probably won’t install the port, since I don’t want to run a single wire from the dash or fuse panel. I didn’t find power at the gang terminal, but that may have just been me not being on a good ground. The wiring hasn’t been touched since it left the factory, and I’d rather not peel back the looming to check each wire without knowing that a hot is there.

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**Author:** ![PastTense](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pasttense/32/14550_2.png) [@PastTense](https://boards.straightdope.com/u/PastTense)\
**Post date:** [June 26, 2018, 11:52pm UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798/2 "2018-06-26T23:52:12Z")

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If no one answers here, try a specialty forum–for example:

> **[1999-2013 Silverado & Sierra 1500](https://www.gm-trucks.com/forums/forum/3-1999-2013-silverado-sierra-1500/)**
>
> A forum specifically for the 1999-2006 GMT-800 based Silverado/Sierra and it's improved 2007-2013 GMT-900 Silverado/Sierra counterparts.   

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**Author:** ![cornflakes](https://avatars.discourse-cdn.com/v4/letter/c/9d8465/32.png) [@cornflakes](https://boards.straightdope.com/u/cornflakes)\
**Post date:** [June 26, 2018, 11:55pm UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798/3 "2018-06-26T23:55:26Z")

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Thanks. I’ve found that the specialty forums can be hit or miss unless you know where to go. Thanks for the recommendation.

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**Author:** ![Dag\_Otto](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@Dag\_Otto](https://boards.straightdope.com/u/Dag_Otto)\
**Post date:** [June 27, 2018, 12:42am UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798/4 "2018-06-27T00:42:33Z")

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Does the 4 pin connector have a pigtail that terminates at a connector? Finding that connector may be worth your time, there a chance that all trucks are wired for 7 pin at the rear of the truck at the connector.

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**Author:** ![cornflakes](https://avatars.discourse-cdn.com/v4/letter/c/9d8465/32.png) [@cornflakes](https://boards.straightdope.com/u/cornflakes)\
**Post date:** [June 27, 2018, 1:35pm UTC](https://boards.straightdope.com/t/2000-gmc-1500-is-there-an-unswitched-hot-between-the-cab-and-the-bumper/816798/5 "2018-06-27T13:35:28Z")

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Very smart! I’ll check it out.