Lance pigtail

Your manual should have it. You can get your manual here: http://www.lancecamper.com/owner-support/

Or, CLICK ME

Do you have 'backup lights'---Yellow wire?

Do you have 12V Power (charge line truck to trailer battery)-----Black wire?

Sounds like maybe the charge wire is missing. All items will work with the exception of charging the batter while traveling.
Contact Lance with the model, year, and serial number. They can fax you the diagram

Thanks -- Can't find my manual, but will look online too ... DUH!! :) BD

Monkey 44, I did a google search and found this info for a lance camper. I am pretty sure they are all wired the same way. Hope this helps you out.

http://manuals.adventurerv.net/Lance-6-way-wiring-schematic.pdf