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I'm having a problem getting my horn to work. The steering column was completely refurbished and it appears I have a small metal strip approx 40 mm long left over which I think came out of the turn/horn signal area. I've worked out I am missing the earth contact so does anyone know where the earth is connected to the steering shaft?
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The steering shaft is earthed to the steering box. There is a small cable which electrically connects the two halves of the steering shaft to steering box flexible coupling.
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I checked a spare steering coupling which does have the internal wire you mentioned, however it had very high electrial resistance which would affect the horn operation. When I looked at the one on my car however, I couldn't see the same wire.
After more checking, I found that the small metal strip I mentioned earlier fitted between one of the turn signal attaching screws and a screw which holds the bearing outer race in place in the switch housing. Once fitted, this would provide an earth connection. Maybe this was a later design change? So my horn now works and thanks for your assistance.
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OK, good news. Mine is a September 1969 HT from Dandenong, and has the earth wire in the coupling. I have seen the coupling earth strap on other cars as well. The continuity of the steering shaft can be suspect, hence what you have was either a modification or, most likely, factory. Refer to the Service bulletin below:
"Dealer Service Letter ADL/69159 Dated August 14, 1969.
HORN OPERATING MECHANISM - HK, HT AND HB.
It has been found on some 'HT' steering columns that the horn switch earth path is unsatisfactory due to additional plastic material having been moulded to the join of the collapsible steering shaft.
A similar condition can occur also on the 'HK' models due to the lack of continuity between the upper and lower sliding sections of the steering shaft.
On vehicles where intermittent operation of the horn exists as a result of this, a suitable earth strap may be fabricated and installed in the turn signal switch. Connect strap to switch and upper bearing retaining screws.
Eventually, earth strap, Pt No. 2812832, will be introduced in Production on all units during which time the ground lead on the steering worm shaft flexible coupling will be deleted on both HT and HB models. However, until straps become available in the field, it will be necessary to fabricate same from .016" brass strip to rectify complaint vehicles."
Regards,
Geoff
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Rank: Member
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Thanks Geoff, that's interesting and is what I have. It came from a donor vehicle made May 1970 in Melbourne, type 80369.
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