In a message dated 8/17/2010 9:38:53 PM Central Daylight Time,
brad.kahler@141.com writes:
> What I think is missing is some sort of grounding wire from the
> steering column to the rack and then from the rack to the frame. This
> TR4 does have the solid aluminum mounts so I don't know that it would
> need a ground wire from the rack to the frame. I'm not sure I see a
> need for a ground wire on the lower metal u-joint that ties the lower
> column to the steering rack.
>
Mr. Brister's solution notwithstanding, the TR6 has a black wire with a
ring terminal that attaches under the steering rack fill plug. Since the rack
itself is mounted via rubber bushings the only ground path is through the
suspension components which is unreliable at best. In fact all the attach
points to the frame are implemented with rubber or nylon bushes If I remember
correctly.
Connecting the shaft to the rack housing is problematic in that you would
need some sort of watch spring arrangement that will wind and unwind as you
turn the wheel. I tried that many years ago when my MGB horn stopped
working. The wire lasted long enough to get me through my annual inspection
but
not much longer. As it turns out there was sufficient rust in the U-joint
connection to prevent electrical conduction and taking it apart and putting it
back together (I forget why I did it) fixed the horn problem. So check the
U-joint of you get no joy. But the shaft to rack housing connection is made
by the gears and bearings inside the rack which are bathed in oil/grease
and should provide many years of trouble free service.
Of course you can bypass all that by using the slip ring solution offered
by my friend Dave B.
Cheers
Dave
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