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randgwarn
01-25-2010, 06:01 PM
The left stop lights on my Big Horn 2010, 3055 were not working, however all the other lights on the trailer functioned OK. All lights also worked OK on my tow vehicle a 2003 GMC 2500 HD Duramax. After reading about a similar problem that was discussed on The Diesel Place forum I took my tow vehicle in to my GMC dealer. It was determined that the hazard module was faulty. The module was replaced and the left stop lights and all the other lights now function properly. Apparently the stop light function for the trailer is routed through the hazard flasher module. Hope this helps someone else since it took me quite a bit of time and research to solve this problem. It was also a little more puzzling because when I would first hookup and check the lights everthing worked, however after a couple stop light and turn signal cycles the brake lights on the left side no longer functioned, I was lucky since I still had right side stop lights. I understand sometimes both sides fail and there are no trailer stop lights at all.

SouthernNights
01-25-2010, 06:05 PM
So the stoplights still worked on the TV? but not on the trailer??

Is the module mouted on the left front fender inside the electrical box?

cookie
01-25-2010, 06:08 PM
Thanks randgwarn. I will store information that in my memory bank. A usefull bit of information like that is good to share.
That's what this forum is all about. Helping out and sharing ideas.

Peace
Dave

SouthernNights
01-25-2010, 06:14 PM
Thanks randgwarn. I will store information that in my memory bank. A usefull bit of information like that is good to share.
That's what this forum is all about. Helping out and sharing ideas.

Peace
Dave

I agree 100%. Well put Dave

SouthernNights
01-25-2010, 06:45 PM
Here are the posts I think randgwarn is referring to:

http://www.dieselplace.com/forum/showthread.php?t=346540&highlight=hazard+module

http://www.dieselplace.com/forum/showthread.php?t=129585