3g alt ground

i put my 3g alt in and it is not charging the batter. had it tested and it is good. i am assuming it is because i have not grounded it yet. i have gathered from jricters posts on this subject that the groun goes fromt he back of the intake manifold to the screw in between the washer fluid fill tank and battery.

well i have two wires there now, one goes to the batter and the other is just dangling there. so if i run a 4 guage wire from this point were does this connect to the intake manifold? and is there anywhere else i can conncet it?

would the lack of this ground cause my alt not to charge the battery?

thanks
 
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