LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1999 >> Mustang Base, 2D Convertible, Automatic >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Charging System - (Generator & Regulator) >> System Tests >> Test B: System Overcharges
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test B: System Overcharges

  1. Disconnect generator 3-pin connector. With key on, engine off, measure voltage drop in circuit "A" by connecting voltmeter positive probe to generator 3-pin connector terminal "A" (Yellow/White wire). Connect voltmeter negative probe to positive battery terminal. If voltage is less than .25 volt, go to next step. If voltage is .25 volt or greater, check fuses and circuit between battery and generator connector terminal "A". Repair as necessary. See WIRING DIAGRAMS  .
  2. Inspect ground connections between battery and engine. Ensure generator mounting surfaces are clean and bolts are secure. On 3.8L, also ensure voltage regulator mounting surfaces are clean and screws are secure. On all models, if all grounds or mounting surfaces are not okay, repair as necessary and check system operation. If grounds and mounting are okay, replace generator and check system operation. See GENERATOR  under REMOVAL & INSTALLATION.
scientia non olet · About LEMON Manuals