Blue98

first off this is the most annoying thing to me, my left blinker in the rear instead of the left light flashing they both do..like hazards and it doesnt stop untill i turn the wheel about 90 degrees idk why. second is sometimes ill be drving and my voltage gauge will rocket to 19(highest possible) and my check gauges light comes on then it usually goes away within mintuits but please someone tell me what to do/replace