After having these installed (by a shop), the belt (brand new Gates) shredded. Then the pulley tensioner went out. After I replaced that, I have another issue. Sometimes when at idle, my interioir lights go dim and my voltage gauge reads low. When I take my foot off the brake, the guages light back up, and also does this when I give it some gas. I used Steeda UD pulleys b/c everyone I talked too (including on this forum) said they used them and had no issues. Could all these be related? Or do I just need to replace my altanator? The battery is an Optima and less than 2 years old.