Lee, you do have some valid points here, but they are not of too much concern for what I am using the engine for. The -fastest- speed I use them on my layout is right at 14 volts, not exceed their limit. These engines are conventional, so I'm not too concerned about voiding their warranty, very easy to fix. As I said, the reason I wired them in series is to get the brightness and RPM up, they were only running at around 7 or 8 volts. Thanks for reading.
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