1986 rx - 7 65k having a problem with a voltage drop from 14.3 to 12.67 battery voltage when any kind of load is placed on the vehicle tho not always a drop to 12.67 but close each time. Has new alt. new gel battery. all the wiring looks okay. attached ground from batt to alt bracket and still having problems.. any ideas?

 

New alternators aren't always good. Here's how to check your alternator.

FSM tests – correct way
DMM tests – quick/easy (Sureshot)
Engine running, headlights & heater fan on high:
Alternator post to alternator frame = 13.5-14 volts steady (verifies the alternator output)
Alternator post to battery (+) = 0 volts (verifies the primary + wire)
Alternator frame to battery (-) = 0 volts (verifies the primary ground)
Turn off the motor, but leave the lights on.
Battery (+) to battery (-) = ~12.5 volts and holds steady. (verifies battery)

 

Did all those checks and still have the problem. also intermit the charge light comes on very dim and when i check the actuall voltage its good.. at about 14.0 volts. the battery and alternator check out good according to your tests. Any other ideas?