Test A: System Overcharges
- With ignition on, engine off, measure voltage between generator terminal "A" and ground. See Fig 1
. If voltage is less than .25 volt, go to next step. If voltage is .25 volt or greater, repair open White/Green wire or battery junction box. See WIRING DIAGRAMS
.
- Turn ignition off. Disconnect generator 3-pin connector and generator 1-pin connector. Measure resistance of Orange wire between 3-pin connector terminal and 1-pin connector terminal. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Orange wire or poor connections. See WIRING DIAGRAMS
. Check system operation.
- Check for loose fasteners or dirty mating surfaces between regulator, generator, and between generator and engine. Check battery ground cable between battery and engine for poor connection. Repair as necessary and check system operation. If all connections are clean and tight, and symptoms remain, replace voltage regulator. See VOLTAGE REGULATOR
under REMOVAL & INSTALLATION.
Courtesy of FORD MOTOR CO.