I swapped a few emails with MTH and they thought it possible a loose wire in one of the harnesses to the female plugs might be the culprit and suggested I check the continuity. I responded to them asking if it was a loose wire why the 60mm drawbar still worked. They replied it’s possible the six pins in the 60mm drawbar may be a tad longer than those in the 30 and 50mm drawbars. 🤷
I’ve loosened the wiring harness in the tender but, that didn’t resolve the issue. I will probably remove the shell and attempt the same in the engine. As for the continuity test, I don’t have a tester and have reached out to a fellow club member to have a look at the engine and tender wiring harnesses. This guy is far more electronically inclined than I and hopefully he’ll be able to determine if MTH’s theory may be correct.
Curt