lights on trailer on when driving

Bobbo wrote:

Chad/Jen wrote:

Bobbo wrote:

Chad/Jen wrote:
When bringing my trailer home over the weekend I noticed that the lights to my truck ('14 Chevy Silverado) were on (not just the DRLs but the actual headlights and taillights).

Since you can't see either the headlights or the tail lights from the driver's seat, how do you know they were on?

The lights on the dash and control panel came on. Those aren't on with just the DRLs.

I have a 2017 F-150 XLT and the dash and control panel lights don't come on with the headlights. They have their own light sensor. In modern vehicles, they may not be a good indicator that the headlights are on. Test that the next time. When that happens again, stop and get out of your vehicle and look at the vehicle tail lights to see if they are on.

All I could afford wrote:
I work with a guy that has a 2015 Silverado 1500. I believe that would be the same design as yours. We work different shifts, but if I run into him in the next few days I will try to check his seven pin connector to see if the marker light pin gets energized when auto lamps come on, and report back to you.

Chad/Jen wrote:

Bobbo wrote:

Chad/Jen wrote:
When bringing my trailer home over the weekend I noticed that the lights to my truck ('14 Chevy Silverado) were on (not just the DRLs but the actual headlights and taillights).

Since you can't see either the headlights or the tail lights from the driver's seat, how do you know they were on?

The lights on the dash and control panel came on. Those aren't on with just the DRLs.

bobndot wrote:

Chad/Jen wrote:

bobndot wrote:
Might be a ground issue on the trailer. Unplug the trailer and put a tester on the 7 way plug on the truck to see if you have power at those pins. If so, its the TT and probably a ground.

If it's a ground problem (with either the truck to TT) why would they work if I turned the knob to on but didn't if I left it in Auto? I'd think they'd either work all the time or none of it.

Sorry I missed that part of your post. I would test the plug to see what's coming thru the plug in both situations anyway.

Did you look at the Silverado forums ? one of the links show where to supply your vin# to GM customer care posted by Jennifer T .
There might be that one piece of info on the chev forum to provide you an answer.

http://www.silveradosierra.com/towing-trailers/no-trailer-running-lights-t629698.html

http://www.silveradosierra.com/electrical/trailer-running-lights-are-not-working-t134298.html

owenssailor wrote:
When the switch was on auto in daylight are you positive that the headlights were on and not just the DRL's. It is unlikely that the headlights would be on in daylight when on the auto setting.

When just the DRL's are on the TV tailights are not on and there are no trailer running or tailights on either.

When I check lights each time to tow I turn the headlight switch to parking GM auto system here in Canada for 20 years.

Bobbo wrote:

Chad/Jen wrote:
When bringing my trailer home over the weekend I noticed that the lights to my truck ('14 Chevy Silverado) were on (not just the DRLs but the actual headlights and taillights).

Since you can't see either the headlights or the tail lights from the driver's seat, how do you know they were on?

Chad/Jen wrote:

bobndot wrote:
Might be a ground issue on the trailer. Unplug the trailer and put a tester on the 7 way plug on the truck to see if you have power at those pins. If so, its the TT and probably a ground.

If it's a ground problem (with either the truck to TT) why would they work if I turned the knob to on but didn't if I left it in Auto? I'd think they'd either work all the time or none of it.