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Not ran it for a few week,bat was well and truly flat got gfs car and put jump leads on,i can start it but when i take jump leads off it stops,not right away if i rev it a bit but that only works for 20 seconds or so,dose bat just need a proper charge or is it alternater or sumet ta.
Probably battery fooked
If you have a multimeter test the battery then test it with car running (13+v at least with it running)
If you get low v with car running thats your alternator
Either charge the battery with a charger or leave your jump battery connected and run the car for a while a altenator requires a exciter voltage to make it work in other words it need a 12volt feed if it is that flat and you remove the jump leads it will not get that voltage and will not charge unlike a dynamo that can charge a battery from stone flat
