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Cool, so what is the plug at the end? There is a wire there but it's been cutWelcome! It's a vacuum tank. There is a vacuum pump attached to the back of the alternator that supplies vacuum for your brake booster.
Now we need more pictures of you Cruiser. We all love pics!
Awsome, much appreciatedIt's a vacuum sensor. If I remember right, on my 1981 BJ42 (that I sold a few years ago), it would light up the Brake dash light if it didn't sense vacuum. But, it's been awhile, so maybe someone else can confirm that.