H4 Adjusting??

RJ Gilliam · 07:24 AM

My left headlight is way to high but for some reason I am missing the mechanical adjustment on how to adjust the high. Where the heck is it? Do I have to remove the entire assembly and adjust from internally?

** I think my assembly is the problem, according to Wayne book, all you do is adjust the screws on the outside of the ring, but this does not move anything.**

s_wilwerding · s_wilwerding's Garage

You'll have to take off the outer ring, and there should be two screws on the headlight assembly. IIRC, one is kind of on the top right, and the other is on the lower left. One of them adjusts left-right, the other adjust up-down. I don't remember which is which, but you should be able to tell pretty quickly by playing with them.

Early_S_Man · 09-16-2002, 07:43 AM

It doesn't take more than a minute to remove and disconnect the entire assembly! Take it to a bench and see if the adjustment screws are stripped. If not, it should be very easy to clean up any corrosion and dirt, then use a high-quality moly grease on the 'working' portion of the adjustment threads. Upon reinstalling ... adjustment should be much easier!

scphelps1 · scphelps1's Garage

I was adjusting mine this weekend, as well. I removed the outer ring, no problem, and could adjust the beams, but then noticed something odd. When shining against a wall, on low beam, the right side is a focused beam and the left is somewhat scattered. When I switch to high beams, the left goes lower and focused and the right becomes scattered. Shouldn't they both have the same beam pattern? Any ideas where I should check? Also, how does the light come out of the bucket?

Thanks,
Clayton

Jdub · 09-16-2002, 08:07 AM

H4s are "handed" for right versus left.

John

diy83sc · 09-16-2002, 08:33 AM

John,

Regarding the righ/left hand build, can you talk about this more?

Also, how should the lights be aligned? I just installed my lights and they appear okay on low beam, the high beams light up "north west" when looking out the windshield.

Tony

RJ Gilliam · 09-16-2002, 09:23 AM

I played with those screw and nothing... So I tried to take the entire assembly off and the bottom screw is rusted/stripped. Not the outer one that hold the ring but the inner one...
This should be fun....

Early_S_Man · 09-16-2002, 10:41 AM

Tony,

What John was referring to is that H4 and H1 headlamp assemblies have lenses available that have focussed patterns particular to UK and 'contennental' markets with left-side steering and right-side steering ... and ALL of them are interchangeable! So, it is possible to have a lens installed for the wrong market, or even for the wrong Bosch headlamp assembly!!! H4 lenses have a large 'H4' cast into the lens ... H1 lenses have no identifying mark, but their upper 'crescent' is plain & clear, whereas the H4 'crescent' is 'beaded' internally.

ps ... Several Pelicanheads have found the wrong lenses in their Bosch headlamp assemblies!!!

jmohn · jmohn's Garage

Quote:

Originally posted by diy83sc
John,

Regarding the righ/left hand build, can you talk about this more?

Also, how should the lights be aligned? I just installed my lights and they appear okay on low beam, the high beams light up "north west" when looking out the windshield.

Tony

This site has all you want to know about lighting (and more). Well worth spending some time here, it explains the difference between US and Euro spec. headlights, relays, aiming, etc. and dispels a lot of myths.

http://lighting.mbz.org/faq/

Jerry M
'78 SC

Rot 911 · 09-16-2002, 11:05 AM

Richard, check out this pic. At about the 3 o'clock position, as you look at the lense you will see lines that look like a wedge shape in the glass. On both lenses they should be on the driver's side of the lense. Does this make sense?

Jdub · 09-16-2002, 11:24 AM

Sorry not to get back to you sooner: WORK of all things, sheesh.

Yes, just as the above posts indicate (and this was news to me when I heard about it) the H4 sets are marketed to the side on which you drive. That's what I found out when I went to replace my very old battered H4s. The new ones did not match and nobody at the store understood this fact.

Be sure to specify this when you order them and note the wedge shape when you do so.

John

Early_S_Man · 09-16-2002, 11:38 AM

None of the Bosch H1 or H4 headlamp assemblies are USA-spec ... so the USA vs E1 spec is a moot point, here!

The only important issues here concerning replacement lenses are:

1. UK vs European left-hand drive lenses

2. H1 vs H4 lenses installed in the wrong housing

RJ Gilliam · 09-16-2002, 01:53 PM

KurtV,

I will have to look when I get home, but yes that makes alot of sense. Guess my first problem is that the lower screw is rusted so I cannot get it out to repair the "adjusters" I appreciate the photo.... THANKS

RJ Gilliam · 09-16-2002, 02:47 PM

How do you tell right vs left?

RJ Gilliam · 09-16-2002, 03:49 PM

I am so sorry to keep posting but I still confused. According to this picture all you are suppose to remove is the phillips screw at the bottom of the light, to remove the headlamp. I have removed this screw and the light will not budge. Am I suppose to remove the screw that the phillips screw screws into? Lower picture.

Early_S_Man · 09-16-2002, 04:07 PM

Yes, most definitely! The slotted screw with threads for the Phillips screw is what retains the headlamp in its' bucket!

BTW, the 'wedge' in the Fresnel lens Kurt mentioned and illustrated ... is present in all H1, H4, and H4 7" bulb replacements conforming to European E-code, and is circled in red on the H1 assembly below ... it is on the same side of the vehicle as the driver!

scphelps1 · scphelps1's Garage

I hate to bring this up again, but I just wanted to say that I was able to figure out my problem, as well. Apparently at some point, some of the leads got crossed in the connector of the drivers side light. This thread helped me get it squared away. The image showing which prong of the bulb should be which wire was very helpful. Thanks Derek.

http://forums.pelicanparts.com/showthread.php?threadid=80335

The link to this was in Richard's other thread.

http://forums.pelicanparts.com/showthread.php?threadid=80335

Determined · Determined's Garage

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porschenut · 09-08-2011, 11:50 AM

Quote:

Originally Posted by Determined

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You're subscribing to a 9 year old thread? And why did you feel the need to post about it?

4flyboy · 4flyboy's Garage

Because he felt like it, is there a reason you feel the need to belittle a fellow member on front street like that?

Have a nice Thanksgiving