Hi there Dave thanks for the response.
I did not change it as I am not that convinced anything is wrong with it.
If I leave on the battery indicator on the kitchen cabinet whilst starting the Eber the indicator is green before start up then goes down to red when the eber first starts up. After after a minute or two the battery indicator goes back to green, leaving me thinking that the sensor is ok.
what do you think?
The only thing that worries me is that every time the thermostat kicks back in the battery indicator goes back to red and continues this cycle.
I had a 65ah starter new and it would only run the Eber for about eight hours before the battery did not have enough voltage to restart.
I do have a 350w rms sub amp wired to the same battery but very rarely have it on when parked.
The thing I did not like about the replacement sensor is that the original one sat on a ring spacer (not sure if the same on the B2L). And the closest part of the sensor sat in that ring unlike the replacements,and was not sure if the difference in the distance of the sensor base would be a problem.
Was yours held in place with a spring and ceramic spacer?
Does that make sence.

Its still out by the way so I can replace easily.