Here is a better view showing how the flasher blades can plug into the #3 and #4 blade slots on the trailer connector that plugs into the truck.
This uses your trailer battery to power up the trailer safety lights. Using the flasher will make them flash. be sure it is a heavy duty flasher,
The safety lights are probably around 1AMP draw of current for each lamp and you could have as many as 10 or 12 of them around the trailer...
You will definitely want to have your shore power cable plugged into shore power so your on-board converter/charger unit will keep the trailer battery charged. If you are camping off the power the power just read the battery voltage and when it drops to 12VDC then stop what you are doing until you get the battery re-charged back up to at least 90% charge state...
You will find out how nice your camping neighbors are doing this especially if you are using the flashing safety lights haha...
Roy Ken
