I did it again....

For simplicity...

Connect a 100uf 30 volt electrolytic capacitor across the 12 volt power to the trailer lights. Be sure the cap has a good path to chassis negative.

Radio shack would have something that would work. Doesn't have to be 100 microfarad -- 20 to 470 would work just as well.

Sounds like a poorly designed input stage on the inverter. What brand and model?

How are you turning the marker lights on?

Do the interior lights "flicker" as well?

dtappy3353 wrote:
Had 1500w inverter installed.

When inverter is turned on, exterior marker lights flicker. Unable to see the flickering during day and just discovered a couple nights ago.

Am puzzled as to what is wrong.

Any thoughts?

Would have to be a ground issue as that's the only commonality between the trailer's marker lights and the rest of it's 12 vdc system.

batteries are full and marker lights LEDs.

Subject line means DIY projects always with issues...wish I knew more but am trying.

Are the marker lights LEDs?

What's the condition of your batteries? What does the subject line mean?