Note. For diagnostic information see the electrical diagnostic manual.
Alternator does not charge
1. Voltage regulator module not grounded.
2. Engine ground wire loose or damaged.
3. Faulty voltage regulator module.
4. Loose or damaged wires in charging circuit.
5. Faulty stator and/or rotor.
Alternator charge rate is below normal
1. Weak or damaged battery.
2. Loose connections.
3. Faulty voltage regulator module.
4. Faulty stator and/or rotor.
Speedometer operates erratically
1. Contaminated vehicle speed sensor (remove sensor and clean off metal particles).
2. Loose connections.