Battery light

Ive recently bought a V reg 1800 Focus, when i start the engine the battery light comes on after about 30 seconds and stays on, i've changed the alternater but no luck, has anyone got any suggestions

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battery
Either you've fitted the wrong alternator- these are NOT internally regulated.
Or more likely, one of the control wires has broken where it appears out of the loom. Fairly common.
Tim..
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