I am thinking you are talking about a Wenger watch, so question edited from 'Wegnar' and the word 'watch' added.
Question moved from Cellphones category to Wenger Swiss Military Watch..
Are you a Watchmaker or a Jeweler? Have a read. My guess is wrong battery, wrong voltage, dead battery or reverse polarity, or bad connection.
https://www.fixya.com/support/r27181038-changing_watch_batteries
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