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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Even easier there are 7 pin to 4 pin adapters with built in LEDs for lights, left brake/turn and right brake/turn voltage. Still doesn't tell anything that a voltmeter or test light couldn't do.
I tried the LED test plugs years ago when they came out. They weren't very reliable then. Maybe better now. I still use a $5 test light.