Can a Door Jamb Switch Short Out?

[Eric R <hoodoovoodooray@xxxxxxxxx>]

When I open my drivers door it blows the fuse for the dome light/brake
light.  I pulled the dome light bulb out thinking that would stop the
circuit,  but when I open the door it still blew the fuse.

So, I clipped the wire to the door jamb switch and now I can open the
door and not worry about blowing the dome light/brake light fuse (they
are on the same fuse).

But, how does the door jamb switch short out?  I figured it was just
completing a ground as it only has one wire.  There's no way to
complete a circuit as if it was a + going to and coming from the
switch.



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