AM 1510 was a country music station for over three decades under several call signs, including WJCO, WDJD, and WHBT.
The WJKN calls were adopted in 1995 and the format changed to a full-service combination of news, talk and adult contemporary music.
Shortly afterward, Coltrace donated WJKN to its former owner, Spring Arbor University, which returned the station to the air briefly in late 2001 and early 2002 with a simulcast of 106.9 WSAE).
WJKN was then again dark for several months, and then resurfaced in March 2003 simulcasting KTGG, whose 450-watt signal does not make it far outside of Spring Arbor.
KTGG, as of June 2017, is broadcasting a simulicast of Strong Tower Radio 91.9 WGCP-FM Cadillac, Michigan.
Effective November 12, 2015, Spring Arbor University consummated the sale of KTGG to West Central Michigan Media Ministries for $230,000.