NASA marine bm-2 battery monitor

saltychef_roamer

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Morning dubers.. quick one I’ve the bm-2 unit and it says to run + wire from the starter battery to the leisure battery with a small inline fuse! Do I need to run a - wire as well as nothing really shown or explained in the instructions cheers in advance
 
That's not correct, you wouldn't join the starter battery to the leisure battery in this way.
 
That's an optional connection to monitor the starter battery voltage. To use it you'll have to add your own cable as it isn't supplied. Connect from the starter +ve with a small 2a fuse, to the screw terminal block on the BM2 display panel. Use the orange terminal. It doesn't connect to the shunt.
 
That's an optional connection to monitor the starter battery voltage. To use it you'll have to add your own cable as it isn't supplied. Connect from the starter +ve with a small 2a fuse, to the screw terminal block on the BM2 display panel. Use the orange terminal. It doesn't connect to the shunt.
Ok thanks for that
 
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