This has been written uo in the forum many times. First make sure you are holding the clamp down tight on the battery. The Honda clamy is a terrible clamp and bends when you overtighten it causing it to be loose. If you can't get it to tighten that way get a thin brass shim and wrap around the post. Auto parts stores have new clamps that can be put on the cable. Talk to ypur local auto parts store expert.