Articles by Vince Fischelli

In electrical system design, testing and evaluation of operating conditions there are two circuit parameters of utmost importance to consider - voltage and electron current.
Ground Circuits
The current clamp is used to measure the electron current in one wire at a time, the preferred method, but it can also be used to measure more than one wire at a time provided the direction of electron current in each wire is known.
ground circuits
When the engine begins to RUN the generator takes over as the source of electrical energy needed to operate all vehicle circuits.
ground circuits
Now that we have a general understanding of electron current through a vehicle ground circuit, we continue begin measuring electron current and understand what each reading is telling us about vehicle electrical circuits during Key ON (KON) and engine run (RUN).
ground circuits
When the engine is running there are significant differences in ground electron current which comes from the generator, the voltage supplier of the electrical system during engine run.
Vince Fischelli
The dual ground configuration is very common but now that batteries are mounted in out-of-the-way places outside of the engine department a single battery ground cable is used to ground the battery negative terminal to the engine block.
Vince Fischelli
In tracing electron current, we find an unusual way that generator electron current flows when the engine is running if the battery negative terminal is grounded to the engine block and to sheet metal at the same time.
Vince Fischelli
The first electron current that occurs in a vehicle’s primary electrical circuit, when the engine is not running, battery cables are connected to a charged battery and circuits are turned ON.
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