Thanks George. This engine was originally a non protosound unit with QSI boards in the A unit and powered B unit. Would the directional lights be incandescent bulbs and operating at what voltage? I installed a protosound 1 master (in powered A) and slave unit (in powered B). New bulbs came with the protosound 1 boards. Would the original bulb from the non powered A unit be useable with the protosound 1 boards? Bob
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