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Today, we're going to show you the Hopkins Tow Doctor Trailer End Test Unit, part number
HM50928. This tool will allow one person to check the trailer wiring and functions are
working correctly. It'll test all trailer functions including right turn, left turn,
brake, tail, backup lights, electric brakes and auxiliary power. You'll notice that when
testing, the unit will illuminate LED bulbs on the tester to show function operation.
It will adapt to a 4 flat, a 6 pole round or a 7-way RV blade. Now included with this
kit, is a blow molded case, the 6 wire round adapter, the 4 wire flat adapter, the 7 blade
round adapter, the adapter clip for the 12 volt battery, as well as the main test unit.
Now on the main test unit, is a white ground wire, as well as a cable with a cigarette
lighter adapter. Now, today will be using the trailer with the 7 blade round adapter,
so we'll take that adapter and attach it to the main test unit. It's keyed, so it slides
in correctly to the unit itself. You need to connect to the main test unit to a power
supply. When connecting it, you'll notice there's a green light on the adapter here
telling us that we have power.