Tent trailer electrical - mystery module

Joined
Jul 7, 2014
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5,129
Location
Winnipeg MB CA
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Helping my friend with the wiring on his tent trailer. We got everything working, but I was curious as to what this little module is. It's in line with the feed to the trailer's positive battery terminal. It says 30 A on it.

I suspected it was a diode to only allow current flow in one direction, but the resistance was zero in both directions, so unless the unit is defective my guess was wrong.

Thanks in advance.
 
And that one is likely not rated for exterior use, much like every other trailer on the road. The same corrosion thats on the threads is likely inside also. They make water resistant ones. A little dielectric grease on the posts will also help.
 
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