Disco 2 battery light

Hi everyone....i know there are countless posts about this issue....but my battery light keeps comibg on periodically even though i have a new battery and the alternator is kicking out a healthy 14.1 volts....almost feels like its a loose wire......the light sometimes comes on if braking or going down or uphill.....any ideas......

In addition...i just undertook a 50 mile round trip with everything ok until last couple of miles..light came on....went out...then came on again.

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