Can a wire gauge be too large?

Volts stay the same, but the amp capability is higher.
Bigger wire does not use more volts. (actually the reverse is true but still depending on amps draw)

Take a 100 foot 14 gauge wire and connect 12 volt DC bulb to it and the voltage at the bulb will be much lower than with 100 feet of 10 gauge with 12v DC.

If there were zero amp draw, then both wires would have exactly the same voltage.