After some delays I'm back on this:
Parasitic Drain: There is none. It was a failing battery.

Wiper Motor: The motor internals must be broken.
I applied power to the fast and slow connectors in turn and could hear the motor turn but there is no movement of the arms.
I lubricated the arms and the blade rotates by hand - this should not be possible unless internals of motor broken?
I removed the cover off the motor and carefully applied power. The large cog and spiral drive both turn.


It looks like a nightmare to remove the lower 3 retainers. They appear to be retained by screws. I don't see any way to get to the center one or the one near the drivers side. . Here is an image of the one that you can get to:



Here is an image of a motor and housing - albeit a rusted poor quality one, showing the 3 connectors.



If I am able to remove the motor does anyone know of an alternative motor that will fit? I would not install a used one.

I'm trying to understand this WIPER MOTOR POST by CATHAMMER to see how it might relate to my wiper problem - specifically the movement of the internal cogs but no movement of the arms. There appear to be some images that are no longer available.

 

I was able to take a coat hanger and hook into the lower clips

Put some heavy grease on them to let soak into

the slotted heads really don't spin out

Someone was able to replace the capacitor on his moter seeing there was enough brush life left

 

I'm going to release the easy one first with coat hanger hook. Looks like the middle one is the hardest. Surely those slotted heads lock the slider and need to be loosened?

 

The clip rust pretty good and you take the metal coat hanger with vice grips on the ends and knock with a hammer

The trick is not too hard as can break the loop hooked into

From the pic you can see the direction you need to pull

If I recall spinning the slotted bolt heads give you nothing

 

Ok. I see what you mean about the slotted head. Here are 2 pictures - one of the housing on my XJ40 (same as X300) and the other showing a housing image I got from the web that had been removed. It seems the slotted screw is either riveted into the body or is bottomed out. Either way it stays in place (which is just as well as it would be impossible to re-install), and the housing hole is as wide as the screw head, enabling the housing to come right out when the sliding retainers are popped off the screw.

Installed Housing


Removed Housing


The middle one popped quite easily. I need to get more PB Blaster on the other 2. I don't want to break them.

 

I successfully removed the passenger side clip this morning. I used Freeze-Off. I resisted using anything other than a coated hanger wire and pulled by hand. Not sure why I'm no longer seeing images.

 

This contributor in Norway was able to replace the capacitor of a certain size and type and you might PM him

Jaguar Forums - Jaguar Enthusiasts Forum - View Profile: Tcasmarcus

See his video.

 

Thanks. I'm leaning toward just buying a refurbished one in the interest of time and lack of information.

In the meantime the motor is out and I separated the motor and housing. I suddenly cannot include or see images for some reason?

I'd really like to understand how to bench test these motors. I know that when I apply 12 volts to fast/slow the motor shaft turns. I have no idea how to test the "park" voltage feed and how the intermittent circuitry works. I'll have to re-attach the "arms" to see if they don't turn under load in a vise. I'm lubricating them over night. The small splines on the shaft and the mating female piece seem ok and the 10mm retaining nut was tight. Can only conclude motor is "bad".

 

Someone had one of the nuts loose so the moter was running just fine

Can't recall exactly the location of the nut

 

This morning It occurred to me to just re-attach the motor (no housing or articulating arms) to the electrical connector on the car and test the motor using the stalk. It only jumps a fraction when power is applied so it sits there nicely when running. All functions work as designed - Slow, Fast and Intermittent. So my conclusion is either the motor internals fail under load or the articulating arms are too stiff. I'm leaving them lubricated today. At least now I know the stalk and relays are working fine.
I believe the internals of the motor may be damaged. After attaching the arms by pressing the serrated connector piece onto the motor firmly by hand I can rotate the motor spindle with mild rotational force. Is that normal?
The question is "Does this suggest I have a motor problem and if so Is this DIY reparable?" I'll naturally rule out arm issues when fully lubricated and re-attached and tested.

 

The 2 relays involved may have burnt power contact points inside that limit the current to operate the motor under load

Swapping options ? I think they are 7606 # relays which are plenty on the car like a headlight.

on the articulating arms a penetration spray may help like ....................

there will be some mechanical resistance on the perminate magnet motor , not like a alternator .

 

I'm going to try to rig up a mounting board/box so I can safely test the motor under load on the car with the articulating arms attached while keeping my fingers safe. Then I can change relays and see if there is a difference.

 

I cleaned up the motor arms and lubricated them. I tested the motor on the car and the spindle rotated in all three speed positions correctly. So I re-installed the motor. Worked fine with the blade 90 deg. from the windshield but would not turn at all with the blade on the windshield. I concluded a faulty motor under any load. So I installed the motor from my XJ40 and all is working.


X300 Wiper motor test on car

X300 Wiper Motor test on car

Status:
Parasitic Drain - Resolved. Was always a bad battery
Wiper Motor - Resolved. Faulty motor.
Locking System - Ongoing.

 

Like your test stand , save your old motor as a capacitator my get that one going

I'm pulling parts from a donor car at a salvage yard ,do you want a motor as I need to remove one to see how the stuff between the motor gearbox and the actuating arms black plastic box stack up

Got lost with mine as iI took it all apart

Tried stacking it back together but not correct on the 3 vertical bolts

 

I'll send you a pm.

 

Status: ALL RESOVED.
Parasitic Drain - Resolved. Was always a bad battery
Wiper Motor - Resolved. Faulty motor.
Locking System - Appears to be resolved. It looks like I have a "lazy" Key Fob. I disassembled it, rubber buttons ok, Micro switches appeared to be okay. I exercised them and re-assembled the fob and all has been working fine for 4 days. I plan on getting replacement micro switches off Ebay as I have a spare fob which has a defective/stuck switch.