Honestly, I'd just get an alternator now and get that out of the way. Your electrical "should" keep up with what you have now, but obviously your alternator doesn't produce shit at idle.
i would go ahead and get an alt man. even if it might be overkill at the moment, gives you headroom for future builds.bigger alternator
Do it! Don't talk yourself out of it... Do it!Just read in another thread people saying to just ground the back battery off itself...2 different opinions