I took some more readings today, because I have been running the car a bit more recently (although still not a lot). I got the following (previous readings in brackets)
Engine off = 12.58 (12.24)
Engine running = 14.52 (14.72)
Engine running with headlights plus front and rear heated windows = 13.70 (14.45)
So, with the engine off the reading was higher (which I expected), but the reading with the engine running was lower, and with the lights and heated windows on, was much lower.
Then, when I turned the lights off (but kept the heated windows on) it went up to 14.60 (which is higher than with the heated windows off). I re-checked later, and with the windows off got 14.50.
Do those readings sound OK? Why would the readings with the engine on be lower than before, when the reading with it off was higher? Why would it drop down to 13.70 with the lights on (when it only dropped to 14.45 last time)? Why would it be higher with the heated windows on, than with them off?
If there isn't a logical explanation, maybe I made an error with the readings. If so, I will check again tomorrow.
Any input would be appreciated.
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