All I can tell you is what I know about from my 1988 244 GL.

There is a connector on each of the tail ights. The harness connected to the left tail light contains all the wires for left and right side lights.

On the foil of the left tail light two of the contacts are double width. These are for the back-up lights and fog lights. On that double width spot are two connections, one from the front of the car, the other going to the right side tail light connector.

Thus there is no separate connector for the fog lights.

At some year after 1988 Volvo discontinued having two rear fog lights.

The harness to the left tail light from the front runs from a 9-pin connector that is located above the driver's left toe. It may be tucked down inside the wire channel that is there under the carpet.

That location is shown pretty clearly in the Volvo SErvice Manual Wiring Diagrams for 240 1987-88. If you intend to keep the car and do some of your own work, I highly recommend that book for your year. It contains the diagrams, using black, red and pink colors, that are copied into Haynes and Bentley.

Good Luck,

Bob

:>)