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Could it be the Isolation relay? Lets cut it up and see! *Warning! Graphic Content* by Chris Hodson
Started on: 10-02-2015 11:11 PM
Replies: 16 (561 views)
Last post by: Chris Hodson on 10-07-2015 08:53 AM
Chris Hodson
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Report this Post10-02-2015 11:11 PM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thank you buddy craig for the informational diagnostic videos you posted a while back. I determined that the isolation relay was more than likely my issue. After calling several parts stores and not being able to find this specific relay I turned to the forum. I now understand nobody really makes it anymore but the fiero store has a few OEM ones they are selling off? As it turns out... Im very cheap. I have a feeling there are many individuals here that can relate to that. SO what the hell! In the spirit of Halloween lets cut this up like a katana to a Zeds torso. Props to you if you even know what that is.

Two min with the dremel resulted in this carnage.



At this point I completely understood why why headlights were not functioning properly. At first i was thinking maybe i could turn it upside down in some muratic acid and see what happens. I decided not to. I dont know how the plastic will react and its so far gone that the wires would probably fall apart. So that led me to a few more min with the dremel and i got this.


Now im feeling like i have something to work with. I cleaned it up and soldered some wires to the leads and got this.


So now with whatever i decide to do with those wires, ill be able to leave the stock connectors unmolested.

Of course Ill be adding a few universal MUCH CHEAPER relays to those wires. I did see on a miata forum some guy had a few switches to control each headlight motor individually, and could make them "wink" and give the car "sleepy eyes". I thought that was kind of neat.

Ill let you guys know what I end up doing.
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Patrick
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Report this Post10-02-2015 11:27 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
Cool.

Now just for clarification... I suspect this is for the '84-'86 headlights. Correct?

[This message has been edited by Patrick (edited 10-02-2015).]

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Chris Hodson
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Report this Post10-02-2015 11:41 PM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
You are very correct.
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Chris Hodson
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Report this Post10-03-2015 01:23 AM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
15 min later I came up with this mess of wires.

Basically one relay for up, and one for down. Anyone with basic electrical knowledge, and a cheap soldering iron can figure this out. Id imagine if someone took the time to make the wires all the same length it would look better as well Oh well. Thats what electrical tape is for right?


..whatever haha A for effort.

It does work exactly how I need it to. The Fiero harness energizes the relays via control of the headlight switch, the relay connects an added fusible power wire from wherever you want to connect it. I utilized the ground in the fiero harness PLUS I added a chassis ground for fun.
I think the best part of this little project is that it was all made from junk i had laying around the garage. I think I had those relays sitting around from a ford Taurus I put together about 6 years ago. I knew those relays would come in handy someday.
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tesmith66
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Report this Post10-03-2015 07:52 AM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Cool!

What does it do?

------------------
1986 SE Aero coupe.

3.4 DOHC swap is complete and running, now just have to finish the rest of the car...

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TopNotch
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Report this Post10-03-2015 08:41 AM Click Here to See the Profile for TopNotchClick Here to visit TopNotch's HomePageSend a Private Message to TopNotchEdit/Delete MessageReply w/QuoteDirect Link to This Post
And that's why people replace the 84-86 headlight system with the 87-88 system.
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Dennis LaGrua
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Report this Post10-03-2015 10:30 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by TopNotch:

And that's why people replace the 84-86 headlight system with the 87-88 system.


The gen 2 is certainly a far simpler and more reliable system, but the actuator modules that control the headlight action do occasionally burn out. The good news is that the 04 Corvette used the same module so they are still available.
As for the headlight actuator relay on the 84-86; a DPDT relay was used and this relay type is widely available, low cost but not as a direct plug in unit. Forum member Bloosberry posted the diagram several years back for wiring in a new DPDT relay and it should be in the archives.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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Chris Hodson
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Report this Post10-04-2015 08:03 PM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by tesmith66:

Cool!

What does it do?



Ever hear of time travel?
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tesmith66
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Report this Post10-05-2015 08:02 AM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
NO WAY!!!!
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Chris Hodson
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Report this Post10-05-2015 04:34 PM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
The way I see it, if you're gonna build a new isolation relay thingy into a car, why not do it with some style?

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sardonyx247
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Report this Post10-05-2015 04:53 PM Click Here to See the Profile for sardonyx247Click Here to visit sardonyx247's HomePageClick Here to Email sardonyx247Send a Private Message to sardonyx247Edit/Delete MessageReply w/QuoteDirect Link to This Post
I did that once before, but for some reason I think I only used one relay.
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Report this Post10-05-2015 07:35 PM Click Here to See the Profile for KhwClick Here to Email KhwSend a Private Message to KhwEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by sardonyx247:

I did that once before, but for some reason I think I only used one relay.


I did something like it also in a 82 Trans Am. I used a 4 pole double throw relay though, but I can't recall if it was 1 or 2 of them (I think it was only 1). The motors are the same as the 84-86 Fiero if memory serves. I don't remember why I didn't just go to a junkyard and try to get a couple of relays there to try out but I didn't. It was really kind of nice after that though as the previous owner had just left the lights up and unplugged the motors. One of my big gripes with pop up headlights...

[This message has been edited by Khw (edited 10-05-2015).]

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fireboss
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Report this Post10-05-2015 11:40 PM Click Here to See the Profile for firebossClick Here to Email firebossSend a Private Message to firebossEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Chris Hodson:

The way I see it, if you're gonna build a new isolation relay thingy into a car, why not do it with some style?


I see what you just did.....
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Chris Hodson
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Report this Post10-06-2015 12:03 AM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Lol I was waiting for that fireboss. Thank you I can see how one could get away with just a single relay...or no relay, but come on... Would pinball machines be that much fun with onlyyyyy one relay? I rest my case.
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TheDigitalAlchemist
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Report this Post10-06-2015 01:52 AM Click Here to See the Profile for TheDigitalAlchemistClick Here to visit TheDigitalAlchemist's HomePageClick Here to Email TheDigitalAlchemistSend a Private Message to TheDigitalAlchemistEdit/Delete MessageReply w/QuoteDirect Link to This Post
Nice work!
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Dennis LaGrua
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Report this Post10-06-2015 02:51 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by TheDigitalAlchemist:

Nice work!



Chris Hodson's two relay approach will certainly work fine but what I was suggesting was a DPDT relay. In other words two SPDT relays in a single packaged unit. I don't want to start drawing the wiring out as Bloozberry has already done that. I will see if I can find his thread.
Here it is:
//www.fiero.nl/forum/Forum1/HTML/088867.html
------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 10-06-2015).]

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Chris Hodson
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Report this Post10-07-2015 08:53 AM Click Here to See the Profile for Chris HodsonSend a Private Message to Chris HodsonEdit/Delete MessageReply w/QuoteDirect Link to This Post
I remember seeing that diagram when I was searching for a solution. That's a better way imo
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