Pro Boss Alternator connections

I have a charging issue with my ProBoss 5.8. The previous owner had the alternator rebuilt, but I think they reinstalled the alternator incorrectly. The alternator charges at exactly 12v (using the gauge, I didn't have my meter with me) but any of the accessories will cause the gauge to drop and the warning light to come on. I took the alternator to a local shop and it tested ok.

The main Power wire was connected to the positive terminal and the ground to the negative, I'm sure that part is ok. However the white wire (which I believe to be the exciter wire) was connected to the same terminal as the positive.

Can someone with a ProBoss check the alternator connections for me and let me know how they are connected.

Thanks