Seems to me your off-load rate is way too slow at 2-3 secs per cycle, let
alone the on-load rate. With such a big difference between off-load and
on-load the problem isn't mechanical but electrical. As I mentioned before
you need to determine whether or not your wipers (and washers and heater
fan) operate with the key in the accessories position or only when the
ignition is on. If they do then the 4-way fuse block is not involved.
Putting a volt-meter on the green black wires and tracing it back through
the in-line fuse, white/green, ignition switch and brown should show where
any bad connection is, or through the green, 4-way fuse block, white,
ignition switch and brown if they only operate in the 'Run' position. It
could also be the motor armature windings partially shorted out, which could
explain high current flow as well as the 'fast;' speed being slower than the
'slow'.
PaulH.
----- Original Message -----
From: Scott Allen <scottinarl@hotmail.com>
To: <mgs@autox.team.net>
Sent: Friday, January 19, 2001 8:22 PM
Subject: Re: Problem: Slooow Wipers
> Max,
>
> I just did the wiper motor. I didn't do the wheelboxes 'cuz I tested them
> by taking off the wiper arms and looking at how they did when turned on.
> They spun fine, didn't check the rpm, but I'd say at least 2-3secs a
cycle.
> I put the arms back and the blades back down and I'm back to 1 cycle ever
> 20secs or so.
>
> Oh well. Not looking forward to taking it all apart.
>
> Best and thanks,
>
> Scott
>
>
> >From: Max Heim <mvheim@studiolimage.com>
> >Reply-To: Max Heim <mvheim@studiolimage.com>
> >To: MG List <mgs@autox.team.net>
> >Subject: Re: Problem: Slooow Wipers
> >Date: Fri, 19 Jan 2001 11:40:52 -0800
> >
> >The old grease problem probably applied to the gearbox attached to the
> >motor. Is that what you cleaned out? And did you remove the actual
> >wheelboxes (directly beneath the wiper shafts)? On my B one of these,
when
> >disengaged from the drive cable, turned out to be immensely stiff, so
much
> >that it could be scarcely turned by hand. A few taps on the end with a
BFH
> >loosened it up, though, and combined with a clean-and-lube of the whole
> >mess
> >sped up the wiper operation considerably. Now they cycle at almost 30
> >RPM...
> ><g>
> >
> >on 1/19/01 10:11 AM, Scott Allen at scottinarl@hotmail.com wrote:
> >
> > > All,
> > >
> > > I've had this problem for a bit now, and it's driving me to
distraction.
> > > When I use the wipers on my 74 1/2 BGT they're real, real, slow. If I
> >put
> > > the switch into the second faster position they're even more slow.
> > >
> > > It was suggested that I may have old grease fouling the motor, so I
> >pulled
> > > it apart and cleaned it with no change once it was back together.
> >However,
> > > I've always thought it was electrical, as I'd noticed the lights dim
or
> > > heater blower slow down when I turned on the wipers, and last night I
> > > detected a faint glow in my alternator light when they were on. I
think
> > > there's a load problem somewhere in the circuit.
> > >
> > > Anyone have a similar problem and worked through it? Since I'm sorta
> >new to
> > > B's I'd appreciate any pointers on where to begin to look...
> > >
> > > Thanks in advance,
> > >
> > > Scott Allen
> > > _________________________________________________________________
> >
> >--
> >
> >Max Heim
> >'66 MGB GHN3L76149
> >If you're near Mountain View, CA,
> >it's the red one with the silver bootlid.
>
> _________________________________________________________________
|