Conversation so far:
who decided the election of 1800 since it ended up in a deadlock
On February 17, 1801, the House of Representatives, breaking a tie in the Electoral College, elected Thomas Jefferson president of the United States.
what caused the 1800 election to end up in a deadlock
The 1800 election revealed a flaw in the US Constitution: candidates for president and vice president were on the same ballot, so running mates could be running against each other.
how was the flaw in the us constitution solved
The 12th Amendment, which changed the US Constitution to prevent the 1800 election problem from recurring, created the current system of presidents and vice presidents running on the same ticket.
what did campaigning during the 1800 election consist of
Campaigning during the 1800 election mostly consisted of writing letters and articles expressing their intentions.

Question: how were the electors chosen for the election
Self-contained rewrite: how were the electors from the states chosen during the 1800 election