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Old 12-11-2010, 09:17 AM
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Upgrading to Halogen Headlamps Question

Looking at an H4 upgrade kit for my '59 pickup. I already have a painless harness and fusebox - do I need to add a relay to the circuit between the headlamp and dimmer switch; or should I add 2 relays after the dimmer switch?

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Old 12-11-2010, 10:59 AM
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I have a Painless harness and just upgraded to H-4. I added 2 relays and a 25 amp fuse after the dimmer switch. I gained a full volt at the headlights. I use the headlight wires from the dimmer switch to trigger the relays. worked great. There is very little current at the dimmer now. Before it would get to 175 deg F in about 2 minutes.Eventually it melted the connector and the switch.

I used a Radio Shack project box for the relays and fuse holder. 12 ga wire for the power and grounds.

The focus of the lights is still terrible. At best I have to compromise on where the high beam is. Between the normal high and low is the best I can get with my current lenses. Low beam just lights up the ground directly in front of the car.....useless.

There has the to be a better bulb than the H4.
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Old 12-11-2010, 12:19 PM
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See attached schematic for controlling headlight dimming using (1) relay.
Also, the Hella headlamp #70-477 provides very good optics that takes full advantage of the H4 bulb.

vicrod
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File Type: pdf 003 headlight dimmer relay controlled.pdf (192.9 KB, 97 views)
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Old 12-11-2010, 02:14 PM
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Here's some good reading about H4 vs the 9003 which I'm using. They do focus fairly well and a heluva lot better then the original H4's, but still could better:



And 9003 bulbs - Wally World, Auto Zone, etc
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Old 12-11-2010, 03:09 PM
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Quote:
Originally Posted by vicrod
Also, the Hella headlamp #70-477 provides very good optics that takes full advantage of the H4 bulb.
vicrod
I also have the same problem with my lenses that bentwings mentioned. They are plenty bright but focus terrible. I have considered the Hella lenses, but at $75 a pop I can put up with mine for no more than I drive it.

Vince
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Old 12-11-2010, 03:29 PM
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I'm about to try this on my lemans but i'm going a lil bit further with the H4 conversion but then adding HID kit to really get the most out of them. I added the HID kit to my daily driver and I can tell you I will not be driving any more cars in my lifetime without the kit! And at only 40 bux including shipping on ebay with lifetime warranty, how can you not? This kit works on ANY bulb even the new cars. I live in Colorado where there are elk,deer,coyotes,fox and even bears that get hit on the road and highways, so I need as much light as I can possible get and for my daily driver, it was litteraly a night and day difference!
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Old 12-11-2010, 04:50 PM
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I just switched to the 9003 halogen sealed bulbs and they are plenty bright. Just last night, I noticed that my light switch feels warm, not hot to touch, after driving with the low beams on. I'm wondering if I should install relays? I was looking at the diagram for 1 relay that Vic posted. What the heck is a "coil" on the diagram? Are they talking ground?
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Old 12-11-2010, 04:55 PM
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The "coil" is the coil of the relay. This is what creates the electromagnetic force that operates the relay.

Vince
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Old 12-11-2010, 05:04 PM
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Quote:
Originally Posted by 302 Z28
The "coil" is the coil of the relay. This is what creates the electromagnetic force that operates the relay.

Vince
Thanks Vince for explanation. I'm going to throw this out for what it's worth. I have several friends who have changed to the H4 lighting. They swear by IPF lights and lens for projection and even protection against rocks etc.. Here's the website if interested.

http://www.ipf.co.jp/English/index.html
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Old 12-11-2010, 07:08 PM
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I was looking at these bases "euro" Crystal Clear Diamond headlamp bases at GM Pauls, $40 a pair - the bullet in the middle looks pretty retro



Their H4 bulbs are $13 a pair, but I was thinking about better bulbs anyhoo

Great posts by vicrod and Irelands child - thanks! But in thinking about vicrod's single relay, the bulk of the load is coming off the headlamp switch feeding the relay at terminal 30, I would think you'd want to avoid that... am I missing something?

Last edited by octanejunkie; 12-11-2010 at 07:14 PM.
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Old 12-11-2010, 09:54 PM
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Yea that diagram isn't quite right. This one is more to the point but is a little harder to understand. You want only the load of the two relay coils feeding through your headlamp switch...mayby 700ma total.

Vince
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Old 12-11-2010, 10:01 PM
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I knew I had a simpler one I just had to search for it.

Vince
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File Type: pdf HEADLAMPS.pdf (12.7 KB, 84 views)
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Old 12-12-2010, 05:59 AM
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Quote:
Originally Posted by kleen56
I just switched to the 9003 halogen sealed bulbs and they are plenty bright. Just last night, I noticed that my light switch feels warm, not hot to touch, after driving with the low beams on. I'm wondering if I should install relays?

That is the very reason to use a relay .................
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Old 12-12-2010, 08:38 AM
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There has been alot of debate in here over whether or not to use relays for headlights. It's not that big of deal to install them. I'm going to install them but I think I'd rather go with the dual relay vs. the single relay method. (one relay for low beam and one for high) just to be safe...
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Old 12-12-2010, 08:56 AM
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No debate, two relays do not make the circuit any safer, nor change the function, gains nothing. Yes it uses more parts and wire, that is all.
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