Fuse. Combi switch. Wiper intervall timer relais. End position sensor
contacts in the wiper motor. Motor gear. Cropped axis and linkage assembly.

The motor is behind a cover in the left firewall. Look first if the
motor is turning, if it has voltage and if the levers are in the right
postition.

At that age it is normal action to reconstruct the whole wiper assembly
including motor, levers, wiper axes, combi switch. At least greasing
everything is certainly needed since service people tend to forget about
such time consuming nonsense.

On Jan 6, 11:40 am, Vasili.Zaitsev1...@googlemail.com wrote:

When I bought my 84 300D, the wipers worked. The next day, they
didn't. I checked the fuse and it was good, old but good, and was
going to start getting to the motor and switch assembly to
troubleshoot things. Before I got to that I bought a set fuses to
replace some bad ones. I went ahead and replaced all of them.
Turns out, the wiper fuse was so corroded that it would not work. I
cleaned the connections with a pencil eraser and installed the new
fuse. Wipers work now.
Don't know if this is the case with yours or not, but maybe this is
helpful.