Doesn't look like it to me. Should be negative when you first turn it on and while the starter is cranking because nothing is charging.
that's what I also thought, but I followed well the wiring schema
the + came from the battery ,and - goes to the light switch
And I suppose that if i invert the threads , the reading will be made in the other way
![Roll Eyes](http://cal-look.no/lounge/Smileys/default/rolleyes.gif)
thx
fabs