Voltage drop at ballast resistor
Lets do this step by step.
Use this diagram or make one like it. Make copies and write on it.
Recharge the battery on a charger.
* For your own education, measure the voltage across the battery while charging.
Remove charger.
* Measure Voltage at Battery Positive, Alternator Output (Bat), and Bulkhead at Red Battery, Black Alt, Blue Run.
Turn Ignition Switch to RUN.
* Note current flow through Ammeter. Should be around 5 amps discharging (3-4 to alternator field, 1-2 to coil and ECU).
* Measure Voltage at Battery Positive, Alternator Output (Bat), Red Battery at Starter Relay, and Bulkhead at Red Battery, Black Alt, Blue Run.
* Recheck Voltage at Battery Positive.
* Observe ammeter. Write down any change from first turning on ignition.
Turn Ignition switch OFF.
Lets do this step by step.
Use this diagram or make one like it. Make copies and write on it.
Recharge the battery on a charger.
* For your own education, measure the voltage across the battery while charging.
Remove charger.
* Measure Voltage at Battery Positive, Alternator Output (Bat), and Bulkhead at Red Battery, Black Alt, Blue Run.
Turn Ignition Switch to RUN.
* Note current flow through Ammeter. Should be around 5 amps discharging (3-4 to alternator field, 1-2 to coil and ECU).
* Measure Voltage at Battery Positive, Alternator Output (Bat), Red Battery at Starter Relay, and Bulkhead at Red Battery, Black Alt, Blue Run.
* Recheck Voltage at Battery Positive.
* Observe ammeter. Write down any change from first turning on ignition.
Turn Ignition switch OFF.
