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I've seen this on 2 nanocoms purchased some time apart, mine and a mates on similar age TD5s.
The voltage is not varying as much as nanocom reports, I'm not sure where it gets it's voltage from (the bus or via measuring input voltage?), but I class it along the same lines as when nanocom reports you are doing 250kph for a second or that the engine temperature is 125c. I can't help but guess that nanocom is a bit relaxed about CRC checking on the bus and hence the crazy values reported from time to time.
I treat the nanocom voltage as for info only, i.e. are we charging or not and don't worry about what value it says from moment to moment.
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and I would suggest anything below around 13.9 is not good either,, hot cold, long trip or shop run.
I had this low V charge for years, The actual culprit turned out to be the two 10mm power bar bolts at the front of the fusebox,,
They were done up tight, but corrosion underneath was causing a bad connection.
I also moved the main engine earth cable to a spot up in plain sight.
4 years, two batteries and one alternator.
at least half a dozen different auto sparkies had a look.
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Coming in a bit late, with my thoughts.
Looking at a couple of nanocom log files I've collected over the years, voltage fluctuations of approx 0.3-0.7v are not uncommon, over 2-4 readings, so if it happens very briefly, I wouldn't be to worried. But if if occurs for a longer duration then something isn't right.
Perhaps make a recording of the instrument feed on a drive, post the data file here Gavin and we can see what is actually happening.
Interestingly my battery voltage starts above 14v and gradually settles down to 13.7 -13.8v if the trip is long enough. Never had any issues and the battery is the one that came with the car when I bought it over 5 years ago. So I guess I'm going to be needing a new one very soon :)
Cheers
Steve
