Hi Wes, this depends on year of building. Your 72 should have the switch for the wiper at the steering column, while the indicator for the speed / interval is a separate switch in the middle console.
For European lhd models this is a bit special, that the wiper switch is on the right hand of the steering column. Regular position for sure is on the left, so that you have to get used to that fact every time you switch cars ...
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Later E9s have that regular setup: Wiper switch and speed control combined in just one switch sitting on the left hand. If your wiper would like to run, although the switch is not turned on it can also be a ground problem from the line of the washer pump. This was my problem last time, when I didn't recognized, that this ground line had contact to the exhaust manifolds (I just had the tank unit not installed and the cables were just swinging around in the engine compartment, beginners mistake
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My wiper switch is on the right. I wonder if this is a hang up with the car's history? It was UK delivered as a CSA in 1972. Records seem to indicate no RHD' CSA being built for that year. Leading me to believe it left the factory as a LHD?
If the pump is still genuine, the answer would be no. The pump is a regular tooth wheel type, which are driven in a separate housing by a simple electric motor. Just be brave once again and unscrew the 4 screws in the corners. This is not critical at all, more or less self explaining. Just be aware not to let the gears fall out and disappear somewhere, while you dismantle it. Maybe the gears are just blocked from something and cleaning solves the problem. If not be that smart to invest in a new pump. No chance at all to reactivate a tired pump/motor.
It seems the pump may have low flow. I'll pull it tomorrow and see if I can get to the bottom of it. When I looked at it today it seemed that it may have been leaking in the past.
I'm really not sure what you're explaining here, so that is not possible for me to find a statement to this :-(
I've been trouble shooting the rear window switches as they are not working. Think it's the switches, not wiring so will replace them.
Best strategy is to remove the fender, but I'm rather sure, that you don't wanna follow this hint. Rust repairs are a very critical point within the different E9 owners. You must figure out what the best way for yourself will be. A lot of really sound looking cars are in reality close to the scrap yards, because a lot of problem areas are hidden by former owners by using various arts. You need to find out if local rust patches are sufficient or better do a restoration from bare metal, which is of course very time and money consuming.