lights oscillate bright and dim whats going on

ok...did it..tested the system ..what i found were good grounds..but the test volt drop in the reg test i came up with .8 ..i checked my grounds and made a new one even..i already had it bolted to the back of the head.my grounde were .1 or .2.my next test was checking batt voltage.12.6 motor off..while running 14.6..the next one said something..pulled off blue at the alt stuck in jumper with lead to the batt...all the pulsing went away and motor ran better..just like instructed[aint fabo members great] to..now if its a harness prob or maybe connector prob where is the likely culprit..i have eliminated the ammeter by going direct to the batt from alt so can i now try connections at the ballast res forward from there and back from there..any help PLEASE TX..J