I've notice that the light from my headlights is really yellow. The lenses aren't too foggy. I've read that this can be caused by voltage drops along the wiring to the headlights. Might this be my issue? If so, where are the likely points for voltage drop to occur?
Thanks

 

Any place there is a connection, it can let moisture in and corrode the copper. Are you sure your charging system is working properly? Should have 13.5-14.0V while running. With my AC blower on high and my lights on, I'm around 13.6-13.8V.

EDIT: And to clean up the foggy lenses, Meguiar's makes a clear plastic polish. Here's what I used:
http://meguiarsdirect.com/detail/MEG+G12310

 

I just replaced both batteries. I'm not sure the charging system is ok, I'll check it today

 

Headlights can "wear out" also. After time they'll slowly get dimmer. You'll never notice it until you put new ones in, and then I'd get SilverStars. They are expensive, but worth it, a much brighter, whiter light. See if that doesn't fix your problem.
Good luck.

 

A fair amount of resistance is developed in the stock headlight wiring circuit, even in factory-new condition. It's the result of Ford engineering taking everything out of the truck that isn't absolutely necessary. In this case, it equates to using a wire-gauge size that is just barely big enough to do the job. When some age-related oxidation begins developing in the connections, we start to see diminished ability to see at night.

A good solution to this is to use close-mounted relays to feed the headlights directly (though fused) from the batteries. There are commercially-available harnesses that do just that, with all the appropriate connectors that make it plug-n-play, or you could do-it-yourself if you're handy with electrical stuff. Unless you are, however, I wouldn't recommend it.

I'd bet that one of our forum supporters like RiffRaff could score one of these harnesses for you pretty reasonably.

Here's an article that explains what I'm describing, though it's generic, and not SuperDuty specific:
https://www.ford-trucks.com/article/...r_Brights.html

Wish I knew where the original author of that article, Steve Delanty, went off to. He was a regular contributor to our old 67-72 FTE mail-list, and he "just disappeared" one day. Glad FTE (I think it was Ken Payne) was able to resurrect that tech article when FTE switched over to web-based forums.

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The wiring harness upgrade and Silverstars will really make a differance. It will run you about $55-65 and worth ever penny. Like Marv said, you can do it yourself, but you need to know what you are doing. The good thing about the ones you buy, you just plug it in to the OEM stuff and you are ready to go.

 

I hate messing with electrical stuff, so I think I'll just wait for my headlights to blow up, then I'll replace with some Silverstars.

 

You must not drive at night or can see better than me. If you do the upgrade,(very simple) then if you do as I did and go with newer headlights 05's for me, you will have that part done.

 

As Steve explained in the article I referenced, only using the higher-wattage bulbs tends to only exacerbate this situation, and you may need the two-pronged approach after all.

Time will tell....

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My 01 had dim headlights, and I upgraded the wiring to the relays. I added aftermarket02-style headlights (clear lenses) at the same time. Now my headlights are just as effective as the new cars. I didn't even change the cheap bulbs that came installed in the headlights! The headlights cost about $110, delivered, bought off ebay.