Firstly I have used several of these relays before, at least 3 and they have all worked well in the engine bay. I used one to hook up an extra backup/high beam set and after about 3 months I noticed that my extra taillights were on but the truck wasn't. I flipped the switch to turn on the relay and the behavior reoccurred. I pulled out the relay and found that it was very wet and appeared to be connecting and actuating the relay. I was able to replace a new one and wrap it to better resist water ingress, but cautionary tale. Consider these relays waterproof, not waterproof.
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