headlight wiring help: 2000 Ranger - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 08-01-2011
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OK I don't currently have access to a computer, and searching on my phone leaves limited options. The low beam on the drivers side just went out, and it's not the bulb. There is no power coming to the positive wire. The passenger side is fine, and both high beams work. anyone have the diagram for the relays under the hood? I'm hoping it's just a relay, but they're not labeled, and I don't yet have a service manual. Anyone have any insight here?
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Old 08-01-2011
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Look at fuse 4 in your fuse box (left of dash), its 10A. That should be your problem.
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Old 08-01-2011
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I have already checked all fuses, and they have not blown. Like I said, both high beams, and the passenger side low beam, work. It is not the bulb. Swapped bulbs, no difference in results. I would have been completely shocked to find out each filament of each bulb had it's own fuse, but I'd be almost as surprised if they had their own relays. I'm leaning toward a break in the wire somehow, but if I knew which relay I was checking, it would give me a good starting point without tearing too deep into the harness just yet.
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Old 08-01-2011
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There are no relays for the headlights. The Red/Black wire comes from your multifunction switch to your fuse box where it splits to 2 fuses (#4 & #8 both 10A) from there they go to each bulbs low light filament. Check to see if you get power to fuse 4. If you don't its probably a wiring problem in the split at the fuse box. If you do there is a wiring problem from the fuse box to the bulb (that white is white and light green).
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Old 08-01-2011
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Yeah, the white/light green is the one I'm getting nothing at. I'll check the fuses again, and the wiring there. I'm mildly surprised that a 2000 vehicle doesn't have a relay for the headlights.
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Old 08-01-2011
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To double check the white light green wire you could do a resistance test at the plug to the fuse. If your ohmmeters wires can reach that long.

The only relays you have for lights are the fogs and park lamps/rear lights. The park lams/rears only have this because there needs to be a relay so the Remote Entry system can turn them on/off when you lock your truck. The fogs have it so they can be deactivated when the headlights are turned to bright.
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Old 08-01-2011
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Well somehow I missed it. Fuse #4 was, in fact, blown. Funny thing is, I have a small LED flashlight that I hold under each fuse to check them, but this one was broken just right that I had to pull it to see it. Thanks for the help. I need to score myself a service manual. I usually get one for every vehicle I own, but haven't picked one up for this truck yet.
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