The wires are silicone insulated high strand count intended to survive flexing. The same wire was used in the 245 tailgate hinge harness, the wiring to the M47 reverse light switch, the AW-70 overdrive solenoid, and the 86+ vehicle speed sensor. In other words, anywhere the wiring needs to bridge two points that move with respect to each other. They don't survive.

Most folks coat the central locking switch wires with liquid electrical tape.

For not much money, you can unplug the connector above your left knee to disable the lock switches and replace the function with keyless entry. Here's my story:

http://cleanflametrap.com/keyless3.html

If you don't do something to fix this reliably, you'll wind up with a dead battery.
--
Art Benstein near Baltimore

To me "drink responsibly" means don't spill it.