Slot Topper Wiring

[cowboygames]

No resistors on the board, each circuit has 11 LEDs with a diode link to the common for rectifiying cuz LEDs are dc of course. So, little over a volt a piece? I spose I could pull my head out and put a meter across the damn lights and see. Gonna take a little bit though as it would seem my head is pretty firmly implanted This is an AC driven circuit

[Foster]

11 LED's and 1 Diode per circuit, 11 x 1.5-2.1V (LED's) + 0.7V (diodes)
That would be normally  17V to 24V per circuit.
I have not come across any LED's that only run on 1V.
Measure the current draw if you can, you may have to measure total and divide by the number of circuits.
Current draw per circuit should be about 20mA up to 30mA per circuit. if you do not have 20mA the voltage is still on the low side.
Normal LED's are happy with 20-30mA of current.

[cowboygames]

11 diodes per circuit and 11 diodes currently running off 12v ac supply. So  11x1.5 and 11x.7 for 24.2v minimum?

[KirkLasVegas]

11 diodes per circuit and 11 diodes currently running off 12v ac supply. So  11x1.5 and 11x.7 for 24.2v minimum?

Be aware that RED LED's are rather low voltage, but BLUE LED's require usually a minimum of 3.5 volts to work. Most Regular and Hi-Brite LED's like about 20-30Ma.
Simply cut a trace and insert a DC Mil meter,adjust variable power supply for the 20 or so mils and read the voltage.
It's VERY common to series up LED's to run on 12 or 24 volts.You only need ONE resistor for each 3 or 6 LED's that way...

Kirk