BMI Battery Monitor

galeus

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12 Mar 2005
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Have I got it right? Trying to correct mistakes that I and others have put in my wiring as regards my BMI battery monitor.

I've put the negative wire from my battery charger to the load side of the shunt.

I've separated the negatives from the two battery banks and put the shunt on the house battery bank.

Can I run the negative from the starter battery to the load side of the shunt or does it have to go to the negative bus bar?

Not the BMI but a Sterling question. Fairly frequently the red light comes on, on my Regulator display,usually when I've altered engine speed. I stop the engine restart and all is well. I noticed when rereading the installation instructions that the temp.sensing wire should come from the neg. battery post, mine is close to it but not on it. I will alter it whilst I am at it but do you think that is the cause. All the wiring is properly sized and sound and apart from the red light jobbie has performed v.well over the past 4 years.

Thanks Richard
 

Cantata

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The wiring rule for the BM-1 is straightforward. Remember that everything going in, or out, of the battery you are monitoring must go through the shunt, so that the BM-1 can measure it. So the only cable attached to the neg pole of that battery should be going to the shunt, and the negative supply for everything you run off that battery is attached to the other side of the shunt.
Can't answer your Sterling query though, sorry.
 

VicS

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This diagram should help

Battery charger negative goes to the same connection or bas bar as all the other negative connections .

No connection, other than those shown, should be made to the domestic battery negative or the the battery end of the shunt.

( the latest BM1 also has an orange wire that connects to the starter battery positive )

scan0058.jpg
 
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