Flickering lights

ford
f250

#1

all the lights on my 1985 f250 flicker,i have checked all the grounds every thing seems to be in order?


#2

Do the lights flicker really fast, slowly or spasmodically?

I’m thinking a faulty alternator.


#3

Make this another vote for a failing alternator.


#4

That is usually a sign of bad diodes in the alternator as the others stated. Bad diodes cause excessive ripple voltage so the lights flicker.