Hi Luis
There are 6 screw terminal connectors on the EV100 logic which are numbered 1,2,3,4,5 and 6 the top row are 1 to 3 left to right and the bottom row are 4 to 6 left to right , so you need to check the top row left terminal TB1 (the one next to the small 6 pin plug) with your your posative meter lead and your negative meter lead on the heat sink with the large diodes on it (Negative). Hope this makes sense
Shane