License Plate Light Dead, Failed Inspection - Replaced Bulbs, Nothing - Now What?

Went to the freakin state inspection in NJ yesterday. This is on my 90
Golf. It fails on NOTHING except the freakin rear license plate light.
For those that have had to endure a NJ auto inspection, you have not
had the pleasure.

Regardless, I replaced the bulbs, no joy. Nothing. Pulled the driver
side panel in the trunk off. Found the wire for the lights measured it
with a multimeter come from the front. So its putting out juice. So I
figure its the blasted harness in the hatch. Most likely a wire is
broken in the rubber boot going up into the hatch.

Is there anyway I can test the wires up there without ripping off the
insulation? Someone mentioned using a pin with the multimeter and
sticking it into the wire.

Anyone have any ideas?

I really dont want to pull the whole dam harness out. Have to remove
the speaker deck panel, the real seat belt, the wiper motor, etc....

Dont want to go there.