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Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

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Old 07-17-2004, 03:49 PM   #1
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3 relay firebird headlight.. .experts only

okay... here's the story... orginally, my car's headlight doors only flipped down, and not up, after replacing the relays for each door i got the driver side to go up and down!!! . however, my passenger side still only goes down. the isolation relay (the one near the radiator) was not replaced. could this be the cause of the passenger side still being faulty, or could it be something else.. thanks
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Old 07-17-2004, 04:08 PM   #2
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It's possible but did you also check the fusible links that go to each of the two actuator relays. They are located in the headlight wire bundle near the left side of the radiator.
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Old 07-17-2004, 04:47 PM   #3
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the fusible links are connected and good. but i need to know if the isolation relay needs to be replaced, or if the wires going to the headlight relay (that i already replaced) are bad.
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Old 07-17-2004, 04:48 PM   #4
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....like i said tho.. the driver side is working perfectly!
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Old 07-18-2004, 03:55 PM   #5
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any help... does the isolation relay need to be replaced!?
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Old 07-18-2004, 05:51 PM   #6
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Here, maybe this will help you.
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Old 07-18-2004, 05:52 PM   #7
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page 2
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Old 07-19-2004, 05:23 PM   #8
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there are two blue wires coming out of the iso relay, one has a white trace.Each blue wire goes straight to a headlite door motor.When your headlite switch on the dash is off, both of those blue wires should have +12V-They provide the +juice for the door motor down circuit. There are two seperate sets of contacts in the iso relay- one for each door down circuit,, switched on by one coil.. I've seen one set of contacts go bad, causing the symptoms you are having..You can prove the defect by cutting into the insulation of the blue wires and checking for +12V on both wires..With the dash headlite switch shut off..
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Old 08-04-2004, 08:18 PM   #9
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the isolation relay is GOOD. the headlight relays are GOOD. what is the fusible link? can someone show me a picture? thanks.....
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Old 08-04-2004, 09:11 PM   #10
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Yes, it is these two little thingies!!!!!
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Old 08-04-2004, 09:23 PM   #11
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now where would those be located in the car?
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Old 08-04-2004, 09:23 PM   #12
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Trickster:

WHAT THE HELL WOULD WE DO WITHOUT YOU?

Fantastic info, exactly what info I needed too!

MOST EXTREME BONUS KARMA GOING YOUR WAY!

B



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Old 08-04-2004, 09:42 PM   #13
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Quote:
Originally posted by Dingley
now where would those be located in the car?
Hello Dingley,

Just follow the treasure map, "X" marks the spot in the headlight wire harness near the left side of the radiator shroud.
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Old 08-10-2004, 07:15 PM   #14
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Where can I get a Isolation Relay ???

as a matter of fact were can I get the other to also, besides the dealer and junk yard.
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Old 08-16-2004, 09:47 PM   #15
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what years are all the info above for ? for an 82 too, or no ? when was it changed from three relays to two relays in these cars ? or was it three wire to two wire ?



thanks
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Old 08-16-2004, 10:10 PM   #16
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Quote:
Originally posted by Fast68
what years are all the info above for ? for an 82 too, or no ? when was it changed from three relays to two relays in these cars ? or was it three wire to two wire ?



thanks
Here is the schematic for the headlight doors for a 1982 firebird. As you can see on the first schematic posted and this one, there is very little difference between the two for the most part. The most noticable difference is the wiring at the headlight dimmer switch. Have fun!!!!!!!
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Old 08-16-2004, 10:31 PM   #17
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good deal

thanks


gonna need all this when i find 87-up motors for the 82, currently are both removed from car and harnesses hanging

so,,

:O
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Old 03-25-2009, 12:59 AM   #18
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Re: 3 relay firebird headlight.. .experts only

hey im having the same problem with my 87 firebrid exept both headlighgst dont go up but they go down...by all of this im assuming its the isolation relay..does anyone knw where its located thanks
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Old 07-21-2010, 07:24 PM   #19
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Re: 3 relay firebird headlight.. .experts only

I have a very odd problem of a similar nature. 1997 Firebird. Recently the headlights were requiring that I switch them off and then back on a couple time to get the lights up and on. Keep in mind I have no motor run-on or grinding occuring. Anyway, now the problem is much worse. If the car is off, the headlights operate perfectly. However, if I start the car the headlights come on and I cannot shut them off. Occasionally, they will stay down, but the lights are on in the closed position. I have checked all fuses and cleaned all available connectors - including on the isolation relay. I cannot locate the fusible links, the main headlight module, or the actuator relays. Is ANYONE familiar with this problem? I am eight hours into this and frustrated as hell.
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Old 07-21-2010, 07:24 PM
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