I'll tackle your tailight question.
The answer is NO.
Just like many cars, the bulb is a two filament bulb. One is for tail light and the brighter one is for brake light. If bright is on all the time, look for a brake light switch stuck on. You could pull out the bulb and look to see if the filaments are both good or run a voltmeter or test light on the contacts in the bulb socket.
I'm betting this is a 6 volt system, but you might wait for someone who knows.