A coalition of good-government advocates on Tuesday called on Assembly Democrats to open up the process by which they are choosing a new speaker of the chamber.

“Our organizations strongly believe that democracy demands openness,” the good-government advocates wrote in a letter. “Backroom dealing and secrecy undermine public confidence and breed public cynicism and apathy. Public confidence in the Legislature is a cornerstone of public support for lawmaking.”

Signing on the letter were the leaders of the state’s main good-government groups: the Brennan Center, Citizens Union, Common Cause and the New York Public Interest Research Group.

The letter comes as Democrats in the Assembly meet for the second straight day behind closed doors to discuss a succession plan.

Assembly Democrats have kept reporters out of the hallway in front of the conference room where lawmakers are meeting. Only a handful of lawmakers exiting the meeting have spoken on the record about the conference’s deliberations.

For the transparency push, the advocates are pointing to the 2007 selection of a new comptroller following the resignation of Alan Hevesi.

Ultimately, Democrats in the Assembly — who due to their combined vote total controlled the process — selected one of their own, Tom DiNapoli.

However, the Legislature at very least held open hearings on replacements for the comptroller. The current situation, say the groups, is no different.

“This open forum created a valuable opportunity for legislators to assess the candidates and focused the public’s attention on the importance of the role of the office in state government,” the letter states. “Though the Speaker is not an elected statewide post like the Comptroller, as mentioned above the position holds significant power in making laws and spending taxpayer dollars affecting every New Yorker.”