My doorbell stopped so I checked the 3 batteries in the ringer unit
with a flash light. Sure enough, one was dead as only 2 would light the
light and the one would not with either of the other. Decided to put3
new batteries in the unit. Later went down to the bench and for some
reason check the batteries on the meter. One was 1.5 volts, the second
was 1.5 and the third was NEGATIVE 1.5 volts! Not dead. I have never
seen a D size dry cell reverse polarity. This unit did work when it was
installed 3 years ago. How is it possible for the D cell to reverse
polarity. The ringer unit is strictly batteries, no AC plug.
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