On further inspection, I found a snapped and frayed cable and a bit of rubber tubing that looked like it once connected to the regulator. I can't really see a way of fixing it without replacing it.
Now, replacing the regulator doesn't seem like a huge job according to the Haynes manual (nothing usually does though) and I was wondering, would it be a hard job upgrading to electric windows or would the wiring just be a nightmare? If so, does anyone have a manual regulator they can sell me?
Thanks


