Just retired my 2002 Subaru Outback LL Bean (250k miles) and for a couple of years prior have been towing a small utility trailer using a cheap Walmart trailer light system by Blazer with no problems. Plugged my trailer into my new Subaru...nothing. No lights. Checked voltage at plug connected to Subaru hitch (had installed post purchase), and have full voltage delivery. Just to confirm, plugged my old Subaru back in and have full lights. What is my issue?!!! See pic attached of plug from trailer plug. Thanks very much for feedback.