So there is a kit from Black Dragon for your headlights that reroutes the power from
going through the headlight stalk's minuscule wire. I hear it uses the stock
headlight signal/power going to the headlight to trip a relay that brings power direct
from the battery. Is that how this is wired up? I have a spare 30A relay that I would
like to use for this while I put my wiring back together.

 

I think Kentetsu had a write up about this. Might not have been kentetsu but it sounds right... I want to say that 2 relays were needed (like in the pic). They arent expensive though so no biggie there.

 

One for highs/one for lows is what I can get out of it. I just don't want to turn my
headlights on and either:

Same output as stock
Not work
Burst into flaming rotary ball

I know Tim has this setup. Wondering if anyone else out there has it.

 

You are correct sir, he did make a thread on it!

https://www.rx7club.com/1st-generation-specific-1979-1985-18/headlight-modification-relay-installation-interest-491459/

So much easier to search his name than to search for "relay" or "headlight"!

 

I just always put kentetsu in the name because most likely hes explained it to someone lol.

 

I put this kit onto my 7, headlights are much brighter. Course also putting in Hella E-codes works wonders either way. I used a similar kit on my 89 Toy PU, and was very happy with it.

The kit comes with relays already. My only issue was that I could not get the outer headlight covers off, so I had to cut the wires and run them into the engine bay from the headlights. Then I spliced them back together.

 

Did you want to wire it up yourself Jesus? I can make you up a schematic and tell you where to get all the connectors if you like.

It will take the load off the stock wiring harness and switch. This could theoretically result in better light output, depending on the previous state of the stock wires and contacts.

If black dragon is selling the same harness that I think they are, the relays included are a waste of time and will fail in a moist climate. Go with the sealed japanese or german relays, not that chinese rubbish.

 

I think I have the jist of it, what I will be doing is using the stock headlight low beam wire to trigger it, with power directly off the battery in 12g to/from the relay. Same deal for high beam. I am wondering if I just want to cut and splice from the plug in on the headlight, or run a dedicated wire into the plug itself...


If this sounds off, then I wouldn't mind a 2nd eye on this

 

lol, looks like I'm a little late to the party.

You will be happy with the difference this mod makes, so don't worry about that. I would use 10 gauge wire (in fact, I did use 10 gauge wire!) rather than 12. If I redo mine, I might even try 8 gauge just to see if it makes any difference.

Also, add in an extra relay and you can run the low and high beams at the same time. This come in real handy if you're in the curves, have to watch for deer, or any time you need a little extra "surround" light along with your high beams...




.

 

Better late than never I would like to run 10g wire, but I got a whole kit that goes from 22g down to 12g, with some other kinds of wiring (phone wires, etc) that I got from Harbor Freight. I swear that will be the new "Home Depot Racing" warehouse!

I have a 30a relay already, but found it only has 1 87 prong and not 2. Might use this to wire up my fuel pump since I still use the stock wiring. That thing is LOUD! Or maybe finish the push button I started...

 

You can get the H4 male and female plugs as well as suitable relays (the 20A micro relay) and sockets for a pro job from http://www.easternbeaver.com

 

Sgt. I'd be interested in that diagram if you wouldn't mind putting it up. I'm sure some others will use it as well.

 

Stu if your looking for comparisons on what the light output will be like check
out my archived thread on the BD harness install.

https://www.rx7club.com/showthread.p...ight=headlight

 

If you understand the concept of how the relay works, its simple to make yourself; however I have seen several of these harnesses at HID stores and they run $12-$15. At that price, its worth it to buy. At $30 from BD - just make your own.

 

Dont mean to high jack the thread cuz now i want this headlight harness too but i couldnt help but notice in the pics that are in that thread that you moved you trailing wires to the leading spots on your dizzy. what does that do?

 

Confuse people mostly

 

Hey TG, did you ever take any pictures with both Hella head lights in place, and if so would you mind posting them? Thanks

 

so just to be different no mechanical advantage?

 

Trailing jumps a big gap and loses spark.

 

I saw your thread, I just can't get my headlight lids off without stripping the bolts
that hold them on. I'll whip up some AFT+Acetone and dribble it on there later today.
Right now it is too pretty outside to be inside. Car wash time!

 

I had the BD one on my turbo FB and it made a noticeable difference. I also had one on my FC and it made it noticeably better on that car as well.

 

"I saw your thread, I just can't get my headlight lids off without stripping the bolts
that hold them on. I'll whip up some AFT+Acetone and dribble it on there later today.
Right now it is too pretty outside to be inside. Car wash time! "

That is the issue I had when I installed my new harness.

"Hey TG, did you ever take any pictures with both Hella head lights in place, and if so would you mind posting them? Thanks "

I have Hella's and will try to get a night shot.

 

Bump!

Hope this is correct, I will be doing this later tomorrow:

 

Yep thats basically it. Make sure you use 12g or better for the power leads.

 

Your relay is wired wrong. You will need two relays, one for low and one for high.

First relay:
85: Stock low beam wire, R/Y
86: Ground
30: Fused 12VDC from battery
87: To low beam terminal on bulbs
87a: No connnection

Second relay:
85: Stock high beam wire, R/L
86: Ground
30: Fused 12VDC from battery
87: To high beam terminal on bulbs
87a: No connection