The Battery Status Monitor (BSM) is a limited range Light Emitting Diode (LED) voltmeter, designed to monitor the voltage across a 12V lead-acid battery in an automotive situation. The original analogue BSM has been proven in the harsh motorcycle arena for many years and is used in CAA type approved "micro-light" aircraft. The digital BSM is a significant upgrade to this successful product, with more features in a smaller and lighter package. The BSM is protected against electrical abuse including reverse connection and unlike an analogue meter it is immune to vibration. The digital BSM has built in ambient light detection, which reduces the LED brightness under low light (night driving) conditions.

Operation

The BSM will change color dependent on its input voltage; the color will indicate the operational state of the battery. The following table shows the approximate voltages for each color, in practice the color changes gradually between RED and GREEN as the battery goes from discharging to charging:

Conventional System

Fitting

Handlebar Version: Tie the BSM to the handlebar using the large black cable tie through the mounting clip, pull tight and cut off the excess tail end. Ensure the serrations of the cable tie are in contact with the handlebar. Run the twin cable to the headlamp/instrument housing and connect as detailed below. If necessary use the supplied small cable tie to secure the connecting wire.

Connections

Join the positive (RED) and negative (BLACK) wires to the ignition circuit and earth, according to the system's polarity. On the handlebar version one core of the 'figure-of-eight' cable has a feint ridge running along the outside, this is the positive lead. For positive earth systems RED (ridged) will be to earth and BLACK to ignition. If the BSM fails to light up the connections could be reversed; the unit will not be damaged, try again! Be aware that voltage drops from heavy loads (headlamp) may effect (lower) the BSM results.