Looking for some diagnostic, and potentially hardware part number help. I have the second generation Great Northern 2-8-8-2 (20-3384-1) released in 2010. I purchased this recently new. The engine performs flawlessly, however, the headlight burned out quickly upon running. I took the engine apart and noticed that the harness for the bulb had an exposed wire. I thought this may have had an impact on the bulb burning out. I since have replaced the grain of wheat bulb (got new one and harness from Midge at MTH) and installed (these are 6V GOW bulbs). The light worked briefly and then burned out again. I reopened the engine again and checked the voltage at the bulb and connector on mini board on the engine and it showed 23.xx VDC on my voltmeter. I know that these constant voltage headlights are supposedly PWM, but I figured I should see 6v at the connector.
Does anyone know what the problem could be? Do you think the voltage regulator board could have gone bad (maybe the short on the exposed wires)? Do I need to replace this voltage regulator board? If so does anyone know part numbers.
Below are pics of the inside of the engine showing the small connector board (appears to be multi connector board the 10 pin harness plugs into as well as the headlight light connector), as well as the board attached to the underside of the boiler (is this board in fact the headlight regulator board)?
By the way, all other lights work fine, marker, cab, rear tender light....
Thanks for your help and direction.
Greg
