Just noticed that one of the four is very weak, I can see moisture inside the lens. It has only been submerged four times while being towed since I keep the trailer closed year round. I'll try opening it up and drying it to see if it comes back to life. I will report the results. Update 6/17/20 Now two of the four lights are off and he hasn't even been in the water since my original comment. There doesn't seem to be an easy way to open the lens without destroying it, so I just removed the one that had moisture in it (I put silicone around the lens and cable entry before installation) and plan on making another one use brand. I removed the second extinguished headlight from the trailer and immediately heard something rattling inside. On closer inspection, it turns out that it is a resistor or a similar component. I also replaced it with another brand. As noted above, these lights were only submerged for a few minutes during launch, a total of four times. Not a good record.
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