The car is a 1995 Mustang GT 5.0 Liter. The left turn signal blinks fast with the front signal not blinking at all. We have taken the bulb and its housing and changed it with the right side and it works perfectly. We took a multimeter and tested the ground and that appears to be solid. We took a multimeter and connected it to the running lights and it posted 10.47 volts when the headlights were turned on. We did the same test on the turn signal and it showed a pulsating current when the turn signal was activated. Really don't understand why the running lights don't work when the multimeter is saying it is getting power or why the turn signal doesn't work when the multimeter is saying it is getting power particularly when we have tested the ground and that is solid?