Fuse Box Problems

[john20]

Hi i have a galaxy mk2 2.3 petrol having a starting problem at the mo some days it will start and others it needs a booster pack on it, had a meter on it charges around 14v, when trying to start it drops to about 8v. had battery and alternator checked both ar ok doing what there suposed to be doing, did have a new starter fitted nt 6mths ago, what i did notice was the engin e fuse box the second black wire was all burnt could find where this wire go's to and if its the problem the usual alternator wires fine changed tha along with the fuse box over 12 mths ago

would apreciate any ones help on this if pos

thanks

john