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Light Flicker When Hooked Up and Plugged Into Truck

kmac7800

Active member
Guys,

Not sure where to post this, as I am not sure it is an "electrical" thing. I have noticed that the last couple of times I have had the RV hooked up to the truck, parked out front of my house the night before a trip, the tail lights (and I think marker lights, however right now as I type this I am unsure) flicker every 10 seconds or so. I have attached a video of the what it looks like.

Any clues as to why this is happening? I have it on a 2020 GMC 3500 Denali and my only thought is maybe the truck is doing some kind of check. Outside that, I am totally clueless.

Thanks!

//KMac

NOTE: apparently a 32Mb video and 8Mb screenshot are too LARGE to upload. Here is a link to it on my Google drive.
 
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