Why Do the Running Lights on My Camper Only Work When My Headlights are Set to On?

Updated 07/03/2025 | Published 06/27/2025

Question:

My running lights on my trailer do not work when the tow vehicle lights are on auto, but work if I turn the lights to always on. Im baffled or is that how the system is supposed to work? 2009 Chevy Tahoe with factory tow package and 2002 Starcraft pop up camper.

asked by: Lois M

Expert Reply:

Hello Lois,

It’s not uncommon for trailer running lights to work only when the vehicle’s headlights are manually turned on rather than set to Auto. In your case, with your 2009 Chevy Tahoe and a Starcraft pop-up camper, the automatic headlight mode won't fully power the trailer’s taillight circuit unless it’s dark enough for the system to activate completely. When you switch the headlights to the On position, the circuit receives full power, allowing the trailer lights to function properly. Annoying thing to have to put them to On, my issue would be to remember to turn them off. But just as long as you have working lights while towing, that is what really matters.

What has been your favorite camping adventure with your Starcraft?

expert reply by: Kate F

Lois M.

7/2/2025

Hi Kate, Thank you so much for your reply. I asked everyone I knew about the issue and no one had an answer. It does make sense though. My Jeep doesn't have auto headlights and the running lights work fine with it. I don't take it though. I downsized from a large camper to the pop up when my husband passed almost 5 years ago. I couldn't see myself pulling that thing around. This is the first year that I've taken it out and just 2 weeks ago did a 600+ mile trip from my hometown of Bozeman, MT down through Yellowstone and the Tetons and over into Idaho. I like the small size and being one who likes to stop often for photo ops the pop up is perfect. Unfortunately, it's not bear proof so I really have to take that into consideration when I travel. Have a safe holiday! Lois

Kate F.

7/3/2025

@LoisM I am very sorry to hear about your husband Lois, but I am happy to hear you are still out there living your best life going on some awesome adventures!! I too like to stop for the pictures, and make sure you always remember to dance in the rain too =) You gotta love the bears! My oldest sister goes to Lake Tahoe a few times a year and she once had a bear break into her car, he couldn't find the picnic basket so you he just scratched up her middle counsel, she now locks her doors. I have never been asked about a Jeep and the running lights, so that makes sense. It would be nice if they could just make the electrical systems all the same. I want you to know that etrailer is always here to answer any questions you have. We never like those emergency situations, but we do have a 1-800 number where a real live person here in Missouri will answer your call to help you on your journey. You have a safe and fun 4th of July weekend as well!