[Dick M]

Thanks to all who responded. I have been running the Laycock for over 10 years. Recently, it started to flutter in and out of overdrive when engaged. I thought perhaps the 12v would keep it engaged.
The Model A Gods took pity on me. I was under the car yesterday and found a slightly loose connection at the overdrive. Tightened it up and the overdrive again works perfectly. Sometimes the smallest unnoticed issue can be the answer.