F3 CHECK THE VOLTAGE DROP IN THE GENERATOR B+ CIRCUIT
Start the engine. With the engine running at idle, headlamps on and blower on high, measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C102C-1 |
Perform a wiggle test of the generator wiring and connections while measuring voltage drop.
Is the voltage drop less than 0.5 volt?
Yes | GO to F4 |
|---|---|
No | INSPECT and REPAIR any corrosion in the generator B+ circuit or positive battery cable connections. |
F4 "A" SENSE CIRCUIT LOAD TEST
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this section. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
NOTE: This step puts a load on the "A" sense circuit. If there are corroded or loose connections, loading the circuit may help show the fault. A 250-350 mA incandescent 12-volt test lamp is required for this step. This circuit cannot be loaded correctly using an LED-style test lamp. Ignition OFF. Disconnect Generator C102B. Ignition ON. Measure and record:
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
Install a test lamp between:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C102B-3 | Ground |
Perform a wiggle test on the generator wiring and measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C102B-3 | Ground |
Is the "A" sense voltage within ±0.5 volt of the recorded battery voltage?
Yes | GO to F5 |
|---|---|
No | VERIFY the BJB fuse 36 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.