I just put new alternator on my 2004 Ford Escape, and now my battery light keeps flashing on and off, and it will sometimes stay on. The battery has been checked and is charging 100 % . The alternator is working properly.
What's wrong ?
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That sounds like a loose connection at a specific wire. Car alternators have a control output to tell the instrument cluster or the ecu that the alternator is running and generating power. It there is voltage on that wire, the battery lamp is off and vice versa. In allmost all cars it's as simple as this.
Most likely the wire on that terminal wasn't properly mounted when installing the new alternator. You can fix this by yourself. To do so, just look for a contact on the alternator labeled "61" or "D+". It is not one of the big ones with thick wires, but a rather small terminal with a thin wire. Tighten the nut or screw holding at that terminal and you should be fine. Note: Disconnect your battery first, otherwise you could cause a short circuit.
Other possible causes are that this wire is damaged or broken. In that case you have to look for the location where it is damaged and repair it.