I had one of those on my last 1275. My sister has it now. IIRC they aren't symmetric. It worked fine on the 1275. I have one of the newer ones now. I like the newer style better.
I believe whatever was connected to the positive should go to the negative and vice-versa. Brown is "hot". So, if you switch to neg ground, then brown would go to positive. It should just be a matter