Troubleshooting Reese Towpower 74643 Brakeman Digital Brake Controller  

I have a 1997 F250 HD and have wired the Reese Towpower 74643 Brakeman Digital Brake Control according to directions with the exception of using 12awg instead of 10awg. The issue I am having is that with no trailer connected I dont get the dot lit up when hitting the brakes or override. When the trailer is connected, itll light the display with both but when hitting the brake itll be a dim 0.5 on the display no matter the power setting and when I override itll display the relative power to where the override is pressed to. I used a probe and a friend to check the continuity at the plug and with only his probe light the brake controller worked fine showing the right strength that was set...but for some reason with the trailer plugged in I would only get the faint 0.5 no matter where it was set to. Is this a ground issue with the white wire out of the 7-pin? Or is there an issue with voltage going through controller? I have a 30 amp breaker as prescribed and tried a new one with no differences, I even hooked the black hot wire directly to the battery and no change.

asked by: Jay