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Old 11-10-2012, 12:20 PM   #1
bruzrs78
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flickering headlights/dash...??

working on my first f.s. 78. i have put a new alt. in and now i have a headlight flckering issue. dash and domelight as well. i have checked grounds and have had the alt. bench checked and was fine. again this is my first older ford i have worked on, so any advise would b awesome.... thanx!
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Old 11-10-2012, 07:08 PM   #2
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This happened on my '88. Turns out the headlight switch was bad. May not be your issue but something to check out.
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Old 11-10-2012, 08:13 PM   #3
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flickering as in, slightly brighter and dimmer? (this would suggest a jumpy voltage regulator. use a volt meter to see if voltage is inconsistent at battery while engine is running)

or, flickering as in, turning off momentarily now and then/flickering off. this would likely be the headlight switch, headlight switch plug, fusable links, or some other connection. turn them on for a bit and feel for a hot connection. heat = resistance (which means problem found)
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Old 11-11-2012, 10:10 PM   #4
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yes i have tried a test on the battery and voltage does jump around or (not consistant) while engine is idling. i noticed at nite in driveway the brake lights flicker also. so i will try my luck with a new voltage regulator. i had already tried eveything that was suggested in that trouble shooting link in this thread. thats y i went alittle further on my own last nite. thanx for your help... it is greatly appreciated.
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Old 11-12-2012, 12:43 AM   #5
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my 88 done the same thing. ended up being the headlight switch like said above.
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Old 11-12-2012, 11:45 AM   #6
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My buddy has an F350 with a 460 in it that keeps murding his head light switches, my money is that yours is bad too.

If it turns out that it's not the switch I would start checking grounds
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Old 11-12-2012, 12:35 PM   #7
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I've had this happen twice.

First time was the headlight switch.
Second time was the high beam switch on the floor.
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Old 11-12-2012, 08:55 PM   #8
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well, now i have a backup voltage regulator. cuz that was not it... yeah i am going to replace the headlight switch and the floor dimmer.. i have gone through the grounds. pulled apart and cleaned off and all that good stuff. im hoping this not going to be one of those electrical freak shows....
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Old 11-12-2012, 09:19 PM   #9
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When you say flicker I'm assuming you mean split second lights are on/off. Does it get worse/better when you hit bumps?
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Old 11-12-2012, 09:25 PM   #10
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Melted power wire plastic holder on headlight switch harness.
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Old 11-12-2012, 09:57 PM   #11
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no it does not get worse running over bumps. it is consistant in high and low beam. and or when dome light is on. also noticed the other night just appling the brakes, and the brakelights do the same. that is brake lights alone.
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Old 11-23-2012, 05:04 PM   #12
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well, well,well... lol! imagine that found and fixed the issue... come to find out there was a bad connection with the wiring harness to the voltage regulator. went out and got a pigtail 4plug harness,spliced the wires and solder together.... and no more "flickering"... man, what a pain it was. and comes down to something so damn simple... thanx for all of your input. it was appreciated!!!!!!
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Old 11-24-2012, 12:40 PM   #13
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Glad you found it! And thanks for posting up what the issue was. :)
Easy fixes are the best.
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