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Good Morning Lou: I've installed the Digitrax DH163AO in six "F" units and have had no trouble other then the first set of bulbs that I burned out. These bulbs are like Cacloe mentioned - 1.5 volt. What a lot of people don't know is these bulbs are 15 milliamp instead of the 30 and 50 milliamps like the Miniatronics. Since the current draw (the milliamps) is smaller you need a bigger resister to cut the voltage to the lamp. Each bulb needs its own resister. I have been using a 1K (one thousand) ohm resister and have not burned out anymore lamps. I don't like the resistors that radio shack carries as they are 10%, I buy mine at an electronics store and pay a little more and get 2%. The % doesn't seem like much but you can see the difference in the brightness of the lamp. Remember your engineer doesn't need this light to see down the track, it's just for you to look at. As mentioned in the other post the first thing you need to do is see if the lamps are good. The way that I do it is to take a 1K resister and put it in series with the lamp and touch the wires to the track. I've found out that if I set the DCSX00 (X being 1 or 2) to the "N" scale setting, the bulbs last a lot longer and the trains don't run that much slower. E-mail me if you have problems: teffy@pernet.net Have a good day Bob
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