What size and shape is the motor - is it cylindrical or has it flattened sides?How much current does it draw at 3v (volts x amps = watts) and how many watts would you like the replacement to use?
You need to get a multimeter and measure the current when the motor is driving a heavy load.
I measured over 500mA with no load (my multimeter doesn't go any higher), going down to around 350mA when I tried to put pressure on the motor.
Uh - how did you measure the current again? Can you show us a connection diagram or something, along with what/how you set your meter?Most meters will measure up to 2 amps or so; many meters will go up to 10 or 15 amps (some you have to switch the positive lead to a special "high current" jack).
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Wow ... a moving coil meter.
They have their uses but for most things a cheap digital multimeter is well worth the investment.
With a moving coil meter you must be sure to connect the probes the right way round as it can't measure negative volts or current (whereas a digital meter can).
ALSO for the first attempt at measuring current just connect the probe briefly so that, if the current is too high and drives the meter right off its scale you can disconnect quickly before damage is done to the meter. Most digital meters have a 10 amp setting which you would use first to make sure you were not going to damage the meter when using the low current setting.