I have an issue with my wipers. They only come on when I press the washer button. I’ve owned the car for 20 years and the wiring appears to be intermittent on the washer motor cover from looking at pictures on Napa website. I have 3 plugs going to the washer motor and some sort of resistor jumping between two terminals on right plug jumping between middle and top prongs.

 

The thing on the connector is a diode.

If the wiring seems intermittent, repair it.

The whole delay/park/whatever PCB and contacts and all that are notoriously flaky on those. Can't tell you which one of those is the defective one, but I don't think you can get any of them individually; not even sure you can get that wiper motor anymore. I had the same problem years and years ago on my 83 L69 Z28, seems like I ganked one off of the local buzzard nest.

It's REAL EASY to substitute in a generic washer pump, whenever that goes out, as it inevitably will, being a total POS... just mount it over by the reservoir with the "suck" hole (hehehe) pointed toward the tank and the "blow" hole toward the washer nozzles; disconnect all 3 of the lines from the stock pump; and use a plastic "T" fitting to t them all together.

You will also find that the motor grounding is highly unreliable. It depends on a little strip of brass under one of the screws holding it to the firewall. The tension on the contacts between the brass and the motor, and between the brass and the firewall, are maintained by the rubber isolators, which as you can see in your photo, are crumbling to dust, hence making the contact COMLETELY unreliable. Very poor and stupid design. You can DRASTICALLY improve on this by connecting a short piece of wire between the motor body (the round part down toward the bottom and a firewall screw someplace nearby.

In case you can't tell I'm not a fan AT ALL of the design of this particular part of these cars.