I am installing the Stebel horn with the TT wiring kit. I understand everything except where to run the ground. TT suggests running directly to the battery and not use a fuse box. I'm ok with that but they are suggesting run the ground to the engine. Its a very short ground wire 6-8" so I would need to splice a wire to extend it to the neg on the battery. Prior threads suggest never use a frame bolt for a variety of reasons. Any suggestions?