Quote:
Originally Posted by dave c59
battery voltage when charged is 12.6v.., engine running at 1500rpm then voltage is 13.6v.
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In my opinion 12.6 volts is low for a charged battery with no load. I think it should be 13.2 V (1.2 volts per cell)
Although an actual measurement is much more accurate and meaningful, I have always used a quick and easy short cut to alternator condition.
Once the engine is running switch on as many electrical circuits as you can to put as high a loading on the battery as possible. Now rev the engine and look at the brightness or intensity of the headlights. If they immediately get brighter the alternator is probably pumping out a good current into the battery.
I agree this method is far from foolproof, and no replacement for some proper measurements, but should give an initial indication.