For almost a year, we had a serious problem with the electrical wiring in this car. When we first bought it, the owner told us that the ignition switch was bad and the car would not start. He gave us a new switch to install, but that did not fix the starting problem. After months of troubleshooting, I found some burnt ignition wires under the dash.
After repairing those wires, the car started intermittently. Two months later, the problem returned and it would not start at all. Man was I ticked off! I could not find any reason for the starting problem. The circuits were all good. Low and behold, I found that almost all older VW's has a similar problem that was easy to fix.
The issue was corrosion in the wires that caused enough resistance to prevent adequate current flow to engage the starter. Compounding this problem was the fact that, by design, all that high voltage had to run from the back of the car, up through the small plastic ignition switch, back to the starter. This long path added to the resistance problem, especially when the wires were old and corroded.
The good news was that a simple relay could be installed at the back of the car, which shortened the distance of the high voltage from the battery to the starter. Wowser - a cheap and easy fix! During my Google search about this, I found out that nearly every vintage VW owner knew about this and had installed a starter relay in their car. Unfortunately, I was new at this and I didn't know many VW owners.
In any case, the starter problem is now resolved! Today we turn the key and the bug fires right up. Praise the Lord!