Nasa BM-1

I would not have hesitated to shorten them. They make the point that the black and white wires must go individually all the way to the shunt and I am sure if there were any other requirements they would have been mentioned. They are reasonably detailed installation instructions. I cannot think of any reason why they should not be shortened.

A phone call would give peace of mind.
 
Will phone them tomorrow...

Having seen that the end that connects to the head unit is not stripped i guess you can shorten it.

Wonder why the black and white wires have to go individually to the shunt then they join together.

I could nearly not use the 4 core wire. The head unit wires would reach.
 
[ QUOTE ]
Wonder why the black and white wires have to go individually to the shunt

[/ QUOTE ] I have not thought it through fully but i guess one is the negative power supply and the other is one of the sensing wires (measuring the potential differences across the shunt). If the power supply flowed in the sensing wire it will affect the the readings.

When William _H gets on line tomorrow morning, that's late this evening in our money, perhaps we will get a detailed explanation
 
I had to lengthen mine by around 2m, with no problems at all.
I can only conclude that shortening would have had the same effect - i.e. none.

It's been a cracking instrument. I wouldn't be without it.

I even had to disconnect it the other week to fit it into a new binnacle I've made to house all the instruments. I expected to have to reprogramme it afterwards, but it remembered all the settings and sorted itself out faultlessly.
 
I fitted one a few weeks ago and dident cut the wires as they were too long, so I just coiled up the excess and stowed it out of the way.
Can you not hide the excess somewhere rather than cutting it, just incase you ever decide to sell it or it packs up and you have to send it away for repair, as it might effect the warranty.
Yes they are a great peice of kit, mine is wired to a system using 2 banks with all negs to one point on engune mounting, yet it will measure all the domestic currents but not measure anything from the start batt or ignition side, which is exactly the way I wanted.
Sometimes the current reading flashes 0.01 amp even though there is nothing switched on, so I guess that is its own consumption.
 
Correct Vic

As the supply current flows through the black wore and volt drop due to the current (very unlickly with short wires ) it would effect the reading.

Simulat concept to battery / machine sensed alternators
 
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