# CHMSL (Third Brake Light) Inop

**URL:** <https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274>\
**Category:** GEM Forum\
**Created:** [July 27, 2016, 6:41pm UTC](https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274 "2016-07-27T18:41:41Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![shagsf16](https://avatars.discourse-cdn.com/v4/letter/s/779978/32.png) [@shagsf16](https://community.electricforum.com/u/shagsf16)\
**Post date:** [July 27, 2016, 6:41pm UTC](https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274/1 "2016-07-27T18:41:41Z")

</div>

My CHMSL (third or center brake light) is inop. Both tail lights/brake lights function normally. I replaced both bulbs in the CHMSL assembly and checked voltage. There is 0 V with no brake pedal applied and .12 Volts with brake pedal depressed and I get 12 V when I read directly from the main wiring harness below the seat prior to where the two wires head vertical up the back of the seat.

I tried to get a reading from the wires going into the light assembly but the assembly is sealed to the top of the vehicle even when I remove the screws.

Any ideas other than running a new set of wires?

Thanks for any help!

---

<div class="post-metadata">

**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\
**Post date:** [July 27, 2016, 8:38pm UTC](https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274/2 "2016-07-27T20:38:18Z")

</div>

Put push pins thru the insulation and take a reading where the wires enter the lamp assembly.

---

<div class="post-metadata">

**Author:** ![Barry](https://avatars.discourse-cdn.com/v4/letter/b/958977/32.png) [@Barry](https://community.electricforum.com/u/Barry)\
**Post date:** [July 27, 2016, 11:43pm UTC](https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274/3 "2016-07-27T23:43:45Z")

</div>

Hi! I had the same problem. There was a connector behind the seat back that had become unplugged. I hope it’s that simple. Barry📈

---

<div class="post-metadata">

**Author:** ![shagsf16](https://avatars.discourse-cdn.com/v4/letter/s/779978/32.png) [@shagsf16](https://community.electricforum.com/u/shagsf16)\
**Post date:** [July 28, 2016, 11:40pm UTC](https://community.electricforum.com/t/chmsl-third-brake-light-inop/6274/4 "2016-07-28T23:40:33Z")

</div>

Thanks for the responses…I will take a look behind the seat this weekend and try a push pin. Thanks!