I have a slight issue with my bike. I’m not running a battery or indicators. My horn work when on Tick over but as soon as I rev the bike the horn cuts out then comes back when revs drop back to tickover. Also my front light work fine and my brake light works fine but my tail light hardly lights up. The bulb works as I’ve tested it on a 12v battery. I’ve stripped all the wiring harness back and found no breaks. Any help.