Additional preview pages of the KEH-P5010R datasheet.
KEH-P5010R Product details
Features
a glass antenna, connect to the antenna booster power supply terminal.
When an external power amp is being used with this system, be sure not to connect the blue/ white lead to the amp’s power terminal. Likewise, do not connect the blue/white lead to the power terminal of the auto-antenna. Such connection could cause excessive current drain and malfunction.
To avoid short-circuiting, cover the disconnected lead with insulating tape. Especially, insulate the unused speaker lea.