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Might be worth checking the battery charging current, nominally 500mA or thereabouts. Also a current limiting resistor gone high value, look for burn marks around resistors in that area.

id say a 500mA charge nominal is far from normal

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In thirty or more years my current readings have been in that region, not always, but more often than not. The reason for mentioning this is to ensure that the reading for the OP is not abnormally low.

for 30 yrs you have seen a battery charge current of half an amp?

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half an amp isnt right a 40 A/h wouldnt need anywhere near that to trickle

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