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Hi all
I've just purchased a Rolson LED battery and Alternator tester for the princely sum of £6.48 delivered from ebay. After looking at moving coil meters (giving a red, yellow, green sector indication but no real measurement) and also scaled voltmeters to give an accurate voltage reading, I felt this gave the best indication for what I want - plus it's magnetic and it suits where I wish to mount it. You get 6 LEDs - one each at 11.5v (red - discharged battery), 12.0v (amber - half charged), 12.6v (green - fully charged), 13.2v (amber - low alternator output), 14.5v (green - good alternator output) and 15.5v (red - alternator output too high (maybe voltage regulator not working?)). This gives me instantaneous information with regard to the state of the battery (batteries via a switch) and confirms charging is happening when the engine is running. It's not the best looking device! (mine is going in a cupboard), but even if you can't stick it directly to metalwork, it's relatively easy to screw or glue a simple small metal plate to most surfaces and means two screw holes and a small hole for the leads as compared to panel cutting!
Hope this helps
Phil
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