Here's the link:
The 12 volt incandescent marker lights have been replaced by LED's, in the form of Christmas tree lights!
There are 70 LED's, each uses only 70 milliwatts, for a total of 4.8 watts. Powered by a 12v 12 amp/hour lead acid battery , through an inverter, the run time is at least 4 hours.
I shot this a video, because the camera would have fired it's flash otherwise.
I kind of drone on, narrating this video.
I have since wrapped the LED's in "lens repair tape" so they are now red on the rear and amber on the front.