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I put these together about a year and a half ago so I might be a little rusty on the specifics. I use the grain of wheat light bulbs and a 450 ohm resister in line with each bulb. I played around with the resistors until I got the right level of brilliance that I wanted before soldering everything in place. The Soundtrax and Digitrax decoders put out 12 volts DC on the lamp leads which will make a flash bulb out of your grain of wheats if you don't use the resistor. <br /> <br />In the operator manual, diesel edition, of the Soundtrax you will find specific CV settings to make the ditch lights operate with the horn function. <br /> <br />Ken, D&J Railroad, Stafford, VA
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