Word began to spread that Zimmerman was more independent than some thought proper, and, one night while he was in another location for a tent revival, church members held a secret meeting at the church building. He discovered their plan and went to the building. When he walked in, the moderator said he had 30 days to vacate the pulpit. Young, out of work, and with new family responsibilities, the couple made a plan. A few hours later, just after dawn, the flyers were being distributed throughout town.
Energetic ministry expands Zimmerman preached throughout the area and beyond.
He understood and used the technology of the day. Radio broadcasts from KOAM in Pittsburg, Kansas, and high wattage stations in Mexico sent his expositions and evangelistic messages all over the United States. He made the 30-mile trip to the Kansas radio station each morning for the 6 a.m. broadcast. When the Second World War introduced gasoline rationing, he commuted by motorcycle. Another ministry outlet for Zimmerman was a paper called Waves of Grace, a semi-monthly he published for 17 years.