Join Date: Jun 2010
Location: Brewton, Alabama, USA
Year: 2000 & 1994
Model: 2000 GL1500SE Candy Spectra Red, 1994 GL1500SE Pearl Bermuda Green
That connector is right there near the brake/tail light assembly. If you read voltage there with the brake on (and ignition switch on) you know everything back to that connector is good. You should be able to see the wire go from that connector to the light socket and another green/yellow going back toward the splice where the power is coming from. The trouble almost has to be in that area because you said the other side works and it gets its power from the same source (but through another connector on the other side).
If you have a Harbor Freight near you, they often have a coupon for a free voltmeter when you purchase anything else there. Or you could buy a test light there for less than $5.00 that you could use to test for battery voltage at the connector.
Only two things are infinite... the universe and human stupidity; and I am not sure about the former.
-- Albert Einstein