Simple battery/alt problem

Check battery voltage when you shut the engine off, and then after sitting overnight. If there is a significant difference, the battery is not holding a charge. On the other hand, the alternator should be putting out in the vicinity of 14.4 volts when running.

Voltage reg or alternator...a properly working charging system should produce 14.5 volts across a normal battery when at high idle with the headlights off. Your 12.6 is much below spec.

You got it Ray...hell, I'd say he has a great battery to start while reading less that 12V...it's for sure not being charged...

My bad, I see that he is only getting 12.6 V when running, yup, I'd start eyeing the alternator/regulator.

I yup, I'll have to look that over I think. Recently had the alt off so im hoping i just missed a connector somewhere!! Replaced the diode pack and reg module last year so i hope its not that. I was just thinking maybe a shorted cell in the battery could be drawing so much current the reg and alt couldnt keep up. But then it has been run flat twice in the past two weeks while ive been working on it so i wouldnt be too suprised if the extra load has killed the reg.

Ta all ;)