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[Kevin Wood]

That's the problem.. You won't get decent diagnosis from someone who's trying to sell you a new battery. Well worth checking all connections and especially engine to chassis  and chassis to battery negative straps.

[Webby the Bear]

doing a dynamic volt test will be a very basic test for if your alternator is working well. batt voltage should increase by at least half a volt when engine turned on. if it doesn't could be a poor alternator. from what ive learned

also worth doing a volt drop test to see if you have a parasitic draw draining the batt overnight

[Webby the Bear]

ps that's from memory from school.... if ive got anything wrong please be gentle
also check connections to alternator

[symes]

reckon cleaning inside battery lugs will sort problem-its amazing how dirty battery terminals can effect voltage