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The ground path in the steering column can get crusty. There was a very thin copper bushing that was placed in the top end of the steering shaft to aid in transfer of ground between the horn tube and the steering shaft. From there, the steering shaft runs in a bushing and has either a bearing or two at the worm to make contact with the ground of the case down there. The case is bolted to the frame so that is the final connection for the ground path. On 90+ year old cars, it's not unusual to have a lot of crust build up in all the transfer areas. Check the ohms resistance from the top of the steering shaft to the frame and see what that figure is. If resistance is high then some cleaning is in order.