Early A Horn Blows on Left Turns

Update: Measuring voltage at the firewall with key on and turn signal switch applied, i find a max of nine volts (flashing) for the driver's side front turn signal terminal (which was enough to light the bulb), and I find a max of one volt (flashing( for the passenger side front turn signal temainal (which is the problem side). Not sure yet how to up the voltage on that side.