Headlights flickering problem???

[86ltrain]

I was out playing last night on some old logging roads and had the strangest problem...after I got out of the woods and back on the road my headlights started flashing on and off all by themselves. It was so bad i had to pull over because I couldn't see. It was like someone was turning the lights on and off really fast. I got out while it was doing this and it was just the headlights, not the running lights. After 30 seconds or so it quit and was fine the rest of the night. Maybe the rough road shook something loose? Any ideas?

[RobbieD]

What year truck? Was the flickering problem on lo beams only, or both hi and lo beams? Generally, the multifunction switch (hi/lo flasher, turn signals, etc.) is the weakest point in an RBV headlight circuit. Without more to go on, that's my first guess as to what caused your problem.

[86ltrain]

Its a 93 model, I swithced from high to low but it didn't change anything. I was thinking it maybe in my turn signal/headlight switch? Is that switch down by the pedals, or actually in the column?

[Jon Boy]

sounds like the same thing i've gone through.

try getting a new dash switch, i don't think it's really the problem. i've just noticed changing the switch works (for a while anyway) the 84 has gone through 3-4 switches, 93 has had 2-3, and the 91 (newest truck) is on it's 2nd one.

i've had this problem with all my truck basicly and have asked on here quite a few times and never got any real answer. so i just change them out when i start having trouble with them. i think the problem may be in the harness plug for the switch. i've noticed the terminal for the high beam (on the switch) always tends to look brownish around the base (shorting and overheating?) and seems to loosen up and get alot of play in it.

my 2cts,
Jon Boy

[RobbieD]

Originally Posted by 86ltrain

Its a 93 model, I swithced from high to low but it didn't change anything. I was thinking it maybe in my turn signal/headlight switch? Is that switch down by the pedals, or actually in the column?

If the problem remained in both hi and lo beam positions, then the combination switch being the problem is less likely. Other possibilities, in order, would be:
1 The main light switch itself is failing.
2 An open circuit, or bad connection or break, in the headlight wiring.
3 A short circuit in the headlight wiring (there's an internal circuit breaker in the light switch, which would open when there's a short circuit or overload with the headlights).

If the headlights aren't working, your best troubleshooting means would be doing a voltage drop test, starting at the headlight switch, then to the combo switch, and then out to the lights.

The combination switch is self-contained; it's all there in the steering column.

[RobbieD]

Originally Posted by Jon Boy

sounds like the same thing i've gone through.

try getting a new dash switch, i don't think it's really the problem. i've just noticed changing the switch works (for a while anyway) the 84 has gone through 3-4 switches, 93 has had 2-3, and the 91 (newest truck) is on it's 2nd one.

i've had this problem with all my truck basicly and have asked on here quite a few times and never got any real answer. so i just change them out when i start having trouble with them. i think the problem may be in the harness plug for the switch. i've noticed the terminal for the high beam (on the switch) always tends to look brownish around the base (shorting and overheating?) and seems to loosen up and get alot of play in it.

my 2cts,
Jon Boy

Jon Boy, having similar similar problems on three different trucks is extremely bad luck, and it's got to be just an unfortunate coincidence.

For what it's worth, like you I have a 1st generation, a 2nd gen and a 3rd gen. The 3rd gen truck, the '94, is the only one of my own trucks that has given me headlight problems. The combination switch kept cooking, so I finally converted the headlights to being powered by relays (I think there's a writeup in the tech library).

On your trucks, it sounds like like you've got an excessive load on the light circuit, to go through that many main switches. You're probably right, in saying it's in the wiring harness. Even if it's never been touched or modified, the wiring can degrade over time, especially in the wiring harness connectors.

If you have more lighting trouble, check the current draw, go over the wiring for corrosion, heat damage, etc., or consider just converting your lights over to being relay powered.

[86ltrain]

Thanks for all the input guys, I think I'll take my main headlight switch out and take a close look at it. its hard to troubleshoot electronics when the problem comes and goes...

[mr_speed77]

anyone know where to get a headlight switch for a 93 ranger? Mine go out and i have to wiggle the switch for them to come back on.

[Jon Boy]

that's a pretty general item, so any parts store would have them. easy job to switch it out too.

[chicagodude]

Greetings Folks,
Sorry for reviving an old thread but...

I have the problem with my 94 Ranger. Sometimes the headlights go out for a second or two or maybe flash a few times and then back to normal.

Is the "combination switch" mentioned the one on the dash which you pull out to turn on the headlights?

Many Thanks!

[RobbieD]

Originally Posted by chicagodude

Greetings Folks,
Sorry for reviving an old thread but...

I have the problem with my 94 Ranger. Sometimes the headlights go out for a second or two or maybe flash a few times and then back to normal.

Is the "combination switch" mentioned the one on the dash which you pull out to turn on the headlights?

Many Thanks!

No, it's the lever on the steering column which controls turn signals, high/low beams, and wipers. The combination switch is behind the plastic steering column shroud. If I'm not mistaken, off the top of my head, removing a couple of phillips screws underneath the shroud will let you remove it to get at the switch.

Good luck.

[Dusty_Ranger]

mine dose this but im running really high wattage bulbs, im gunna try some normal bulbs tomorrow