I had the Suzuki heated grips installed on my '12 DL650. On the high setting I get a little heat in a narrow horizontal strip at the front of the left grip and basically nothing in the right grip. Are the OEM heated grips basically junk, or might I have defective grips or maybe instalation error? If an installation error is there something specific I should have the shop look at? I'm not a wizard with electrons and I'm not sure the shop mechanic is either.