I'm not familiar with Garbing, either, but can you plug the gloves directly into the controller? If so see if there is any difference, or heat between plugins. I rather suspect it is in the wiring junction where it branches off both arms to the glove end, as you are getting negligible heat from both gloves, rather than just one.I have 12V Gerbing Vanguard gloves and their heated jacket liner. The highest setting I have ever used for the jacket liner is 1-3 in under 30 degree weather and the jacket is toasty and warm. However, the gloves at the full setting have never felt warm. I can feel just the tiniest bit of warmth in the gloves at the highest setting, but nothing even close to jacket level. I use the dual controller and have looked at my cabling situation several times. Gerbing has been no help. The gloves are extremely well made and comfortable if I can just get some more heat. This is my second cold season with them without any change. Just trying to figure out if they should work to the level I expect or just to the level they currently perform.