A convicted child molester long suspected of kidnapping and killing Etan Patz is refusing to help another man set to go on trial for the killing next month in Manhattan.

Jose Ramos was hauled from his Pennsylvania prison to New York this week after lawyers for Pedro Hernandez — who cops say confessed to the crime but has now recanted — said they plan to call him as a witness.

But “he is not voluntarily going to offer any information at the upcoming trial,” said Ramos’s lawyer, Frank Rothman, in court Friday. “His intention is to plead the 5th. He wants no part this.”

Ramos, 71 was long the prime suspect in the 1979 disappearance of the 6-year-old Soho boy.

Hernandez lawyer Harvey Fishbein said Ramos can only refuse to answer questions that could incriminate him criminally.

“There are many questions we can ask Mr Ramos in which we don’t believe his right to the 5th amendment applies and that will go to his motive and opportunity,” Fishbein said.

It’s unclear whether Manhattan Supreme Court Justice Maxwell Wiley will allow Ramos to take the stand or possibly limit the questioning of him.

The Patz family pursued a wrongful-death suit against Ramos at one point, and a civil court deemed him responsible for Patz’s death in 2004 in a default judgement.