Check the listing for details. Trailer Circuit Light Plug Tester Set 6 pole & 7 Flat Pin RV Vehicle Socket. Condition: New. Listed at 28.25 USD. LED Trailer Plug Tester 12 Volt DC These tester are for the trailer light plug. (6 & 7 Pin) Analyzes tail light, turn signal and ground connections and confirms them with bright LEDs. Checks conductivity of all circuits, quickly identify lighting problems. This tester will test the following: Marker Lights Right Turn Left Turn Stop Lights 12V Power supply Electric Brake Controller Back up Lights (6 pole will not have the Back up Lights) Ground Wire If the ground wire is disconnected, the lights will not work. This listing is for 2 testers You will receive 1 - 7 pin and 1 - 6 pin Items will be shipped from Pennsylvania, United States. Shipping Terms: Only within the United States. It is our goal to keep all item in stock and be able to ship same day or within 1 day. We do not have E-bay and our Accounting program linked so the number of items, in inventory, may vary from what it says we have on e-bay. We also have a brick and mortar store that customers can stop in and purchase parts so our inventory changes daily. If you would like to check stock of an item feel free to call or email Your payment is expected within 7 days of auction close. Unpaid auction wins will be forfeited after 7 days and Non Paying Bidder Alert will be filed. Items will be sent out within 48 hrs upon receipt of payment from winning bidder. A Delivery Note will be sent to inform Bidders of their expected ETA (Estimated Time of Arrival).Questions Feel free to contact us through E-bay. NOTE: As our company is a Business Entity, our offices are closed on Saturdays & Sundays. Therefore, if you send us an email over the weekend, kindly wait till the next working day for a reply.