Pretty easy task... Unplug your 7-way cable and either plug in a short jumper or flasher unit in pins 3 and 4.
This will connect your trailer battery to the side marker lights and either just turn them 'ON' or 'FLASH' as you want to do. Some folks will plug-in a 12VDC ATC BLADE FUSE in pins 3 and 4
You won't be a well liked camper doing this at night for very long time periods...
Its a great idea for when you have to call security or rescue squad. Just tell them its the trailer with flashing marker lights going...
![](http://rvbasics.com/techtips/images/rvplugart.gif)
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS