Ok here's my problem 98 SVT when driving the car any time above 3500rpm all the dash light's light up like a christmas tree and the headlight etc are brighter then ever i notice on my volt meter when this happen's it shoot's from 14 volt's to 18volt's any idea's I though it was possibly a lose ground checked that cleaned post and put ground back to batterie and still same prob i was thinking alternator regulator !!!

thanks any idea's would be a help

your voltage regulator is done!!
i would be geting that fixed ASAP