Topic: usb port, voltmeter

[evinrude7]

is there a specific amperage range to stay in for the bike when looking for one of these gadgets? 

[Deltarider]

is there a specific amperage range to stay in for the bike when looking for one of these gadgets?

I don't know what you mean. Measuring volts and ampères are two different things. Old British bikes used to have ampère gauges and so does Enfield (made in India) but although ampèremeters are not very accurate, they do tell you when the system charges or decharges. Some bikes (Italian and some old Yamaha's) had a red light coming on when the dynamo failed. Kawasaki on some models had the tachometer double as a Voltmeter (you had to press a button and you could read the voltage instead of the rpm) an elegant solution. All in all a voltmeter gives a better indication of the 'health' of the system but, quite frankly, IMO you don't need one.

[evinrude7]

is there a specific amperage range to stay in for the bike when looking for one of these gadgets?

I don't know what you mean. Measuring volts and ampères are two different things. Old British bikes used to have ampère gauges and so does Enfield (made in India) but although ampèremeters are not very accurate, they do tell you when the system charges or decharges. Some bikes (Italian and some old Yamaha's) had a red light coming on when the dynamo failed. Kawasaki on some models had the tachometer double as a Voltmeter (you had to press a button and you could read the voltage instead of the rpm) an elegant solution. All in all a voltmeter gives a better indication of the 'health' of the system but, quite frankly, IMO you don't need one.

You don't follow my question because I don't know what I'm talking about.   is there a specific range electrically speaking one should stay between when looking for one of these units?

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[TwoTired]

is there a specific amperage range to stay in for the bike when looking for one of these gadgets?

Voltmeters measure potential.  So, you need only ensure it is able to withstand the max voltage expected in the application.  Amperage doesn't matter.
Ammeters measure the push in electrical circuits.  They include a shunt to measure the voltage drop across it, as the meter is inserted into the circuit under test.  Again, you must ensure the meter's shunt is capable of withstanding the expected maximum employed in the circuit under test.

[evinrude7]

is there a specific amperage range to stay in for the bike when looking for one of these gadgets?

Voltmeters measure potential.  So, you need only ensure it is able to withstand the max voltage expected in the application.  Amperage doesn't matter.
Ammeters measure the push in electrical circuits.  They include a shunt to measure the voltage drop across it, as the meter is inserted into the circuit under test.  Again, you must ensure the meter's shunt is capable of withstanding the expected maximum employed in the circuit under test.

ok i was wondering if any of the units out there would pull too much power on these bikes. 

[Jerry Rxman Griffin aka MuthaF'er]

No, not for this application.