Upfitter switch for flashing clearance lights
 

Anyone try this? Sure would be convenient when hauling the 5er.

How does flashing clearance lights help in towing? I'm not sure I understand the application.

Flashing back the "thank you" when passing a semi. Most big rigs and buses will have a "flash" switch to flash the clearance lights without affecting headlights. Just curious if anyone has thought of this with their SD since you can't flash the clearance/running lights without turning off your headlights.

Aaah, got it. So many functions in today's vehicles are controlled by computers. Not sure where you would tap into the trigger wire for the marker light relay.

My Pete has the flash switch. On the Ford, I just reach over and hit the hazard switch, let it blink 3 times and turn it off. Still kinda hate the hazard switch in the center of the dash.

This is what I do as well. :-X22

just use the hazards. trying to find the right wire would be a pain

I use my fog lights.

The cab light harness should run down one of the front pillars not sure which one. Wouldnt be hard at all to extend one of them and hook it to a switch.

Here's a question: will flashing the clearance lights by themselves on the truck also have the same effect on the trailer (clearance lights only flashing) or is the trailer wired such that all of the running lights are on the same circuit and wouldn't flash if you clicked your new button that flashes clearance lights by themselves on the truck?
Would you have to isolate the trailer's clearance lights somehow and then feed them from your truck's clearance lights to get the desired effect? I'm slightly interested and may do it on my 7x18 enclosed bike hauler if it wasn't a huge PIA. Have an upcoming Florida vacation planned and this would be a cool feature. But not cool enough for me to mess with my trailer lighting outdoors in 20 degree weather.

As far as I know, roof clearance lights, mirror clearance lights, tail lights, and parking lights are all on the same circuit, operated by one switch.
For "come on over" turn your headlights off, then on.
For "thank you" flash your hazards three or four times.
Stay inside, cozy and warm, don't jack your lights up and be that guy driving down the road with one really bright tail light that goes dim when he steps on the brake. :-X22 :-X04

Good advice. I don't need another cold weather project. It's a 7x18 set up to haul 2 bikes up front. Yesterday 2 new wheel chocks arrived so now I have to set it up to haul 4. That's enough crawling around when today's high is predicted to be 17ºF.

Yes all marker lights on an automotive style trailer are on the same circuit. 18 wheelers are able to flash trailer clearance lights independently because their clearance lights are on their own circuit.

The last thing I want to do is jack up the lights, and hazard switch is ok, but there's an obvious thank you with the running lights. Very intrigued about tapping into the cab lights but wondering if that will also affect headlights. Wondering about tapping into the 7-pin running lite contact which I could break directly with an upfitter switch so I'm only flashing the trailer lights. Or I could just stick with using the hazards.

I like the idea of blinking the trailer lights but with the way newer trucks are wired I probably wouldn't do it. Most truckers including myself know what the three flash hazards mean and appreciate those that do it.