No Spark help
Quick lesson in electric circuit.
Key off, lights off, all of the uninterupted wires connected to the battery will be at battery voltage.
Measure voltage at any of those connections or wires and they will be at battery voltage.
If we put a test light in the line, it won't light up because there is no current flowing.
Turn on the parking lights, and the current flows through the test lamp and eventually back to battery ground.
If the test lamp and parking lamps draw 5 amps the flow path will look like this.
Since there's no flow in the alternator's output circuit, it acts like an expension of the probe.
We can be pretty sure its 12.0 Volts at the bulkhead connector and the main splice. The first is relatively easy to check directly, the main splice is not.
Then the question is where is .3 Volt drop coming from?
In this example it might very well be the test lamp.
Measuring the drop directly shows that is majority of the resistance.
Quick lesson in electric circuit.
Key off, lights off, all of the uninterupted wires connected to the battery will be at battery voltage.
Measure voltage at any of those connections or wires and they will be at battery voltage.
If we put a test light in the line, it won't light up because there is no current flowing.
Turn on the parking lights, and the current flows through the test lamp and eventually back to battery ground.
If the test lamp and parking lamps draw 5 amps the flow path will look like this.
Since there's no flow in the alternator's output circuit, it acts like an expension of the probe.
We can be pretty sure its 12.0 Volts at the bulkhead connector and the main splice. The first is relatively easy to check directly, the main splice is not.
Then the question is where is .3 Volt drop coming from?
In this example it might very well be the test lamp.
Measuring the drop directly shows that is majority of the resistance.
