Monster 659 Owner's Manual page 31

If voltage is 9.9 Volt or less, the word "LO" is shown flashing
E and the Vehicle/Engine Diagnosis light (EOBD) (8, fig. 4)
FLASHING
comes on;
if voltage is = 16.1 Volt or higher, the word "HI" is shown
flashing and the "Vehicle/Engine Diagnosis- EOBD" light
(8, fig. 4) comes on.
FLASHING
fig. 22
30