hey

i have a 1981 f250 that i was driving down the road light went out turn signals didn't work and then shut off so far i've replaced the alternator, and belt the neg and pos battery terminals the voltage regulator and the ignition switch i have run out of ideas on what is draining the system side note this all started the day after i changed all the pluggs and wires don;t know how that could effect anything almost like something is drawing on the power constantly please help me find the problem

TOMHANIk
Remove battery cables from battery-Clean with terminal brush--even if they look clean,and clean battery posts.Leave cables off and charge battery.
NOW-start checking, almost everything feeds from starter relay.MAKE SURE IT IS IN PARK OR NEUTRAL.
A volt/ohm meter is helpful,at minimum a test light[cheap].
Report back

I Have Already Cleaned The Battery Forgot To Post That Are You Saying It Might Be The Starter Relay Itself Is Drawing Power

Double check your cables -look for corrosion both of them--if you find corrosion in cable,under insulation,replace cable.You can check voltage w/volt meter.Be sure battery is good, and fully charged.Could be relay.Could be any number of things.Guessing-bad ground.

Also check the back of your alternator to see if you bumped/broke/knocked a wire off.

check the wire harness to the alternator
they corode after years of use
take the wrsping off the harnness and probe them with a test light to make sure they are hot
the harness i think is on pssenger side under hood along fender well

if you replced all that stuff
then there is a bad connection between the battery and alternator

did you replace the battery? If not check for voltage from the poss post to anywhere on the battery.