Near Intersection of I-35 & I-90 Southern Mn. | I have Nav IIs in two tractors. One of my SonAlerts went bad so I looked for a replacement on Amazon but noticed there are several models. I went to my dealer and they gave me one off an old harness. In the SonAlert in your picture the red would need to be positive. Other SonAlerts that I've seen have had two metal terminals but there were polarity markings so I'm assuming the polarity is important. I'm not certain of the desired voltage range.
Over winter I was fooling with some buzzers and an Arduino board. With this arrangement they used a PWM output to produce the sound.
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