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Old 01-16-2002, 12:16 AM   #1
rallysquirrel
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Question Help on headlight wiring harness

I'm looking to upgrade the wiring harness and need some advice. I went to http://www.autobulbdepot.com/fr_prod...39736561327287 and found some nice wiring harness, but don't know which one will work for a 97 Legacy Outback

AM72040 Head Lamp Upgrade Harness-H4 systems (2 bulb connections) $49.99

AM72043 Head Lamp Upgrade Harness-dual H4 systems (4 bulb connections) $49.99

AM72064 Head Lamp Upgrade Harness-H4 ground switched systems (2 bulb connections) * $49

*Ground switched systems require a special harness

Thanks

By the way I already have another wiring harness for the fogs. I'll be upgrading to the Hella 500 amber pretty soon
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Last edited by rallysquirrel; 01-16-2002 at 01:04 AM.
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Old 01-16-2002, 08:42 AM   #2
HIHO
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Make your own harness. It is cheaper. All you need is some 16-18 guage wire, two relays, some male/female connectors and your ready. Go here for a diagram.

http://lighting.mbz.org/tech/how_to/relays/

It is realy simple. Email me with any questions.
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Old 01-16-2002, 10:49 AM   #3
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I know it can be done but don't know where to buy male/female H4 connector. thanks!

Ernest
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Old 01-16-2002, 01:14 PM   #4
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Default Another source

I got mine here, 9007 Ground switched;
http://www.hioutputbulbs.com/har.htm

Only took about an hour to install.

Glenn O
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Old 01-16-2002, 10:24 PM   #5
lustreking
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Quote:
Originally posted by etam
I know it can be done but don't know where to buy male/female H4 connector. thanks!

Ernest
The female sockets I got at Autozone, or Advance Auto, one of the two... for the male end, I just put male spade connectors and plugged them into the socket

If anyone's interested, I can try to take some pictures of my diy harness and post them tomorrow

here's more good info on making your own harness
http://www.susquehanna.com/susq/other/headlamp.htm

-Steve
www.lustreking.com
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Old 01-16-2002, 10:47 PM   #6
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Yes, yes, pics please!
Does those female connector comes with any wire? or pure socket only?

Actually, do you think I can just go to junk yard and get some H4 female connector and replace with heavy duty wire? Can the wire be replaced?

Ernest

Last edited by etam; 01-16-2002 at 11:02 PM.
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Old 01-17-2002, 01:27 PM   #7
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alright, here's the female connector that I've called the socket


It came with wires already attatched, but I removed them and attatched my heavier gauge wire to the connectors inside. I don't remember exactly what this socket was called on the package, but I know it said nothing about H4. Just look around for something that looks like it would fit...

Here's what I did for the male end...

you can see how I plugged my harness into the factory system. The relays for the hi and low beams are attatched to the battery hold down, with a bracket I made.

Any questions, feel free to ask

ps. let me know if the pics are too big, if so, I'll resize them

Steve
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Old 01-17-2002, 05:51 PM   #8
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steve,

Did you just add a separate set of relays to beef up the wiring? Or was this also for swappin bulbs?
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Old 01-17-2002, 06:20 PM   #9
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Quote:
Originally posted by legacy777
steve,

Did you just add a separate set of relays to beef up the wiring? Or was this also for swappin bulbs?
Well, some of each... The original plan was to beef up the wiring for higher wattage bulbs, but the ones I bought were worse than the stock wattage, so I switched back to the original bulbs.

-Steve
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Old 01-17-2002, 09:57 PM   #10
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You MUST have relays to upgrade the lighting harness.
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Old 01-18-2002, 10:15 AM   #11
rallysquirrel
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Lightbulb Thanks

Thanks for all the feedback. I've still got one question, where exactly do you hook up to the factory system. I don't have a garage and will be doing this in the cold, so I want as much info so that I don't freeze my ass out there too badly.
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Old 01-18-2002, 11:52 AM   #12
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All my best work is done in the street when it's cold, at night, when it's raining... ask my neighbors.

Anyway, if you buy one ready made, it shouldn't take more than 15 minutes to install. There'll probably be 3 (maybe 4)connections. There'll be power which you'll hook to your battery, then one or two grounds, then there should be a plug that plugs into your factory headlight socket.

If you're building one yourself. You can put it together inside the house (after doing some measuring) then take it outside and install it as above.

-Steve
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Old 01-19-2002, 10:14 AM   #13
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How much of an improvement will this result in. I just put in Hella Micro DE fogs, which are an improvement, but I still need to aim them.
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Old 01-19-2002, 10:16 AM   #14
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Enough to make it worth doing.
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Old 01-26-2002, 06:38 PM   #15
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Default Need more relay help

If made the harness and installed everything.
But now I only have high beams. Low beams don't work, and really funny thing is that when I turn on the fogs that I put in last week, the hibeans shut off. The fogs were wired to only be on when the low beams were on.

For the headlight upgrade, I only ran two wires from the old headlight socket. Is this a ground switched light system(95 Legacy Canadian model).

I am not panicing to much, it's above freezing here, when I did the fogs it was -10 C......
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Old 01-26-2002, 07:34 PM   #16
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Yes, It is ground switched, as posted early in this thread.

Glenn O
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Old 01-26-2002, 08:30 PM   #17
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geralds34, I did the same wiring yesterday but no luck! Same result.. only high beam on... stupid Canadian wiring with day time running light???

I did some probing and here is the result:

looking at the oem headlight female socket:

high beam:

horizontal 11.6v
------
| |
0.6v(left vertical) | | 12v (right vertical)

low beam:
0.5v
------
| |
11.6v(left vertical) | | 12v (right vertical)

I should follow the diagram in here but looks like high/low beam trigger is wrong??

edit: wiring is completely CORRECT!
http://www.susquehanna.com/susq/other/headlamp.htm




Last edited by etam; 01-27-2002 at 04:56 PM.
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Old 01-26-2002, 08:43 PM   #18
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ground switch?? from here??

http://lighting.mbz.org/tech/how_to/relays/

have to read carefully again....
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Old 01-26-2002, 08:55 PM   #19
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I think I might have something else wrong. I am using a 5 post relay, also has a 87a post. Diagram on relay package shows "Power to Lamps(87 & 87a)". Most info I have found says one is a normally open, and other is normally closed.
Check out http://catalog.com/susq/other/auxlamps.htm, there is also a note about ground switched lights.
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Old 01-26-2002, 08:57 PM   #20
HIHO
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The fogs use the high beam as a ground so when the high beams come on the ground for the fogs is broken.
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Old 01-26-2002, 09:10 PM   #21
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I use the same relay (from CanTire) with 87a... sigh... and so I guess I can only use one 87 terminal and splice the wire to left and right then.

very tricky.. but I am glad there is help around!!!

Actually, I don't know.. right now I only have wiring for driving side only (didn't hook up other 87 terminal yet...have to do more testing later..)

Ernest
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Old 01-27-2002, 07:09 AM   #22
geralds34
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I asked the question in the alt.autos.subaru newsgroup the first of week, and didn't bring my notes(I in the woods in Quebec on weekends). Here is Dan Sterns suggestions.

> I've read a bit about rewiring the headlight to use relays and heavier
> wires, and have a couple of question.
>
> Does Subaru use the ground to switch the lights on/off?

Some do, some don't. I don't recall which ones are which, but the only practical effect when installing relays is that you must use BOTH existing headlamp wires to trigger the relays, rather than just grounding the control circuit of the relay at whatever convenient location strikes your fancy. The easiest way to do this is to power one relay with the low-feed and ground wires on one side of the car, and the other relay with the high-feed and ground wires on the other side of the car.

> I am in Canada, have DRL, any weirdness in doing the upgrade?

Yeah, headlamp-based DRL systems can complicate the matter. I should update my site to discuss the matter. You don't specify the year and model of your car; Subaru has used various high- and low-beam DRL systems. The best, cleanest way to do it is to disable the factory DRL system and re-implement DRLs using one of several strategies. If you'll be specific about which system you have, I can comment further.

> Where can a decent H4 socket be found(I am in Ottawa).

The best one is the Hella unit, which has spring clamps to accept up to 10ga wire. A much-better-than-average unit can be had at NAPA under Echlin number LS-6235, phenolic high-heat socket with phosphor-bronze terminals and 14-gauge wire.


With respect to the H4 socket, Ken and rallylights.com said all sockets are limited by the connectors on the bulbs, and the using a connector with 18 gauge wire wouldn't cause a problem, just keep the amount of 18 gauge to a minimum(6 inches).
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Old 01-27-2002, 04:54 PM   #23
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Just follow the above wiring diagram and driver side work now! passenger side doesn't work because I am using 87a of the relay.. shouldn't be a problem, just splice up the wire and put in bigger fuse for high beam...

Ernest
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Old 01-27-2002, 08:30 PM   #24
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I used the 87a post, and it worked fine. Don't think those packages were labeled right.

Had the headlights figured out, but took a long time to get the Hella fogs working on low beam again.
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