Whelen: Service Update – M4, M6, M7, M9
The M Series lightheads have been updated to allow Low Power activation in the Steady and Signal Alert™ Steady patterns. Low Power intensity has 5 levels. To select apply 12 volts to the power and low power wires, then use the Scan-Lock™ wire to cycle through intensity. The Instruction manuals for the M4, M6, M7 […]