Normally voltage with around 13.8-14-4v... thats a healthy range. If it drop below 12v the battery is consider weak but still able to crank and use. If the voltage is above 14.5 its over charging. Bro ray you can install a voltmeter to monitor your battery strength. It cost around $30-$50+ depending on how simply your voltmeter is. As for horn... I am currently using Hella Strongtone. Not the loudest but enough to get your attention. If you are free join us for the mega meet up on the 20th. Get to meet some of the DIY guru on that day. You might be interested in some of the mod or accessories they added to their 2 wheeler.