May well have a thermal fuse and if that has gone well its gone due to an
issue.
That old a device probably used ni-cads and they do not have much of a
life, so unless you feel inclined to make up a battery pack from nickel
metal hydrides and make a proper charger that is smart enough to know when
to stop charging, maybe its time to been it?
Brian

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The Sofa of Brian Gaff...

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"D.M. Procida" wrote in
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I have an old B&D cordless drill; the batteries don't charge.

Either the batteries or the charger are faulty.

I've opened up the charger. At the input of the transformer, I measure
240V. At the output, 0V (I'd expect 18V or so).

I assume this means that the transformer itself is broken - at least, I
can't think that anything in the circuit after the transformer could be
responsible.

I haven't desoldered the transformer from the circuit board, but I guess
that would be a way of being sure.

Is that correct?

Daniele