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I can only give you what I have on an '88 240.
Your '91 may or may not be different.
The wires to the turn signals are both found in the main front-to-rear harness, along with a gang of other wires.
Green wire is left turn. Blue wire is right. They run from the rear, in that harness, to a 9-pin connector that is around the driver's left toe. It may be stuffed into the wire cover, or hung up above the knee pad.
One side of the connector has slot #3=one green in, two greens out. Slot #4 is one blue in, two blues out.
That connector may be the one your tech is talking about. That fat harness runs under the driver's seat in a little channel, then under the wire cover, and then it's up to inside the dash stuff.
You will need to remove the knee pad and peel back the carpet. The wire cover is a piece of galvanized sheet metal, held in place with a single screw. Remove the screw (and put is somewhere safe) and manipulate the wire cover off.
You should see a number of connectors and relays in the upper part of what was covered. Use the colors listed above to identify the connector in question.
Here's all nine:
Starting upper left -
#1 GR = gray...Fuel level.
#2 R-Y = red-yellow...Fuel pump.
#3 GN = green...Left turn.
#4 BL = blue...right turn.
#5 W = white...rear fog light (s)
#6 Y-GR = yellow-gray...Left brake light.
#7 Y = white...Right brake light.
#8 BL-R = blue-red...tailgate washer.
#9 SB = black.,,back-up lights.
I hope this helps.
Good Luck,
Bob
:>)
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