Less than 1 minute ago
\r\n \r\n Try a wiggle test on the plug that goes to the alternator..my 93 ranger everynow and then does the same thing and it just my plug.double check wires... check batterys terminals...if not possible a bad battery gauge.... does the car act different when the voltage drops? battery is how old?? also when you had it tested it probably wasnt in the vehicle so their could possible be a cracked plate in the battery that when u hit the right bump take the right turn etc... it could case the plate to shift and cause you low voltage.. more information would help thanks GL\r\n