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Mike, I don't have a schematic for the board.  The first thing I'd suggest checking is whether AC voltage is getting to the circuit board.

Going by the picture of it you provided, I would guess that the 10 pin connector with the rainbow of wire colors goes to the GreyHound Sign.  One hot wire per light and a single common (or vice versa).  I'd suggest checking for voltage going to the lights (maybe DC) there by inserting the tip of your meter probes into the back of the connector to make contact with the metal pins inside.  I think the lights are supposed to flash in succession, so it may take a few seconds to see voltage at any one pin.

As far as getting a replacement board if you need one, maybe you could contact MTH parts directly:

info@mthpartsandsales.com

Last edited by SteveH

First thing I would do is check to see if power is getting to the board.  Likely the black and red wires.  If those wires have a plug, be sure the pins in the socket don’t have cold or broken solder joints on the board.   I believe the sign lamps are 18 volt bulbs, so the output from the ribbon cable, with respect to a common lead (likely black) should pulse DC voltage.  I believe the other two plugs (black, blue and white)  are for the interior lights.  Been a while since I worked on one.  We just replaced them since it’s a $20 board.  BTW, according to the MTH parts website, the board is out of stock.

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