Alternator wiring

To me there appears to be a common voltage drop across automotive aftermarket ammeter shunts?

So, on amazon there are a large number of automotive shunts with 75 millivolt drop.

A large variety of amperage handling ratings too.

There are also higher differential shunts on amazon.

Maybe a person could use one of these and get a consistent calculation correlation relative to their factory car ammeter?


Search shunt under automotive on amazon.

[ame="http://www.amazon.com/Amico-Ammeter-Current-Measure-Resistor/dp/B006Z954QA/ref=sr_1_3?s=automotive&ie=UTF8&qid=1364868748&sr=1-3&keywords=shunt"]Amico Amp Ammeter DC 300A 75mV Current Measure Shunt Resistor - Amazon.com[/ame]


Maybe the voltage drop is not significant enough to cause a good reaction from the factory gauge?

Possibly an option for sensitive DC electronics concerned with interference and AC noise, a DC-DC switching power supply to get clean power rather than directly off the auto +

Ive used these folks a few times and their products are reliable. I am not full of oscilloscopes so I dont know much about the power out other than it works for my telecom equipment long term.

They are friendly and will discuss applications and features over the phone too.

http://www.powerstream.com/su20-1212.htm

http://www.powerstream.com/dc12-12-8A-isolated.htm