Oops, my fault, must read the question more carefully!! It does seem to be
the washer, not the wiper, that's mis-behaving!
I understand the US cars were graced with an electric pump long before the
UK models - although my UK '73 BGT has a DPO-bodged electric motor that
seems to work OK!
It looks like there is a permenant live supply to the washer pump along a
green or green/pink wire. So this wire should always be hot. A light
green/black wire should then lead to the switch, which completes the route
to earth when pressed. For some reason this light green/black wire is
providing a route to earth all the time, it seems likely.
Disconnect the light green/black wire from the washer switch. If the pump
doesn't pump then the problem lies somewhere in the switch, it's not turning
off. If the pump continues to pump, then there is a route to earth
somewhere along the length of the green/black wire. This is most likely to
be at one end or the other, although it is possible that somewhere along its
length the wire has chafed on something, wearing through the insulation, and
the short circuit is there.
Richard & Nancy
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