I talked to Speedway tech support and concluded the problem is in my turn signal switch. I have confirmed that power through the brake light switch is being delivered to the turn signal switch so next step is to take the switch apart to see if I can fix it. It is a new to me, appears to be not previously used column mounted switch that I got from a fellow Bolter.
I should have realized the turn signal switch is where the turn and brake light circuits must intersect but didn't until clued in by the Speedway tech support person.
