Thank you for such a quick response!
I looked at the LM3914 driver when I naively thought that the voltage would change until it peaked at 12V! The turbine charges the battery via a regulator. I assume that I put a low value resistor (10Ω?) in the positive line from the generator and use wire from the battery side of the resistor into pin 5 (sig) and a wire from the negative line to pin 2 (V-) with pin 2 also connected to ground
In battery powered circuits where is the "ground"? - can I use the -ve terminal (since ground makes the return part of the circuit) or can I just connect the grounded wires together (is this "floating ground?)
Sorry if I sound stupid, but I have just semi-retired and finally have time to tinker with some electronics. I know that starting with something simpler would be more sensible, but I have to solve this problem if possible! I greatly appreciate your time and expertise! Dave