Join Date: Feb 2006
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it dose sound like a bad earth.
when your jump starting it your giving it more voltage and if theres a freyed or coroded earth strap ur giving the current more push to bridge the gap.
as chriss said check all conections and security of earth straps .
you aslo can but a jump lead from the earth terminal striaght onto the engine but preferibly the starter housing and try and start it .
its worth a try m8 ,it may well be the altanator but these little tests cost no £dosh just a bit of patiance.
Currently in alex21's garage:
vx astra mk5 2l turbo