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Help with headlights

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'77 280. stock. conducted continuity and voltage checks on steering column combo switch =OK. headlights themselves(taken off car) =OK, fusible links =OK. fuse box fuses, front contacts and rear of fuse box panel =OK. both sockets for the lamps are dead.

i do notice that the wires leaving the fuse panel are red with yellow stripe (normal driving lamp), and solid red (hibeam), yet the wires at the socket (pass side) are red with black stripe. is there a splice i'm missing? from the fuse block to the socket there doesn't seem to be anymore splices (or harnesses) in the large main loom going through the firewall. any help is appreciated.

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I have a 78Z. My headlights did not work, but the high beams did. I jiggled the fusible links, and they started working. Perhaps it was just luck. You might turn the light switch on and jiggle each of the fusible links to see if the lights go on. If so, then you only need to clean the contacts.

Good luck!

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Actually you're wrong. Solid red is the right headlight and red with a yellow stripe is the left headlight. Hi beam at the sockets is the red/white and the low beams are red/black.

Hi and low beam are determined by the T/S stock and are red/white and red/yellow. They swap colors in the harness somewhere, that's where they turn red/white and red/black.

I believe the 280Z's have relays near the battery for hi and low beam. look for those same color wires going into the relays near the battery. The relays could be bad or check for power in that area. I think the 280Z's also have a passing relay as well but that may only be on the automatic. Not real sure.

Let us know what ya find out.

Dave.

Hey John, Where were the fusable links located at? just for both his and my sakes

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Dave,

There aren't any oem relays for the lights in a 280Z. At least in the 78 280Z there arent. The relays are mostly for the ignition and fuel stuff. A couple for the safety equipment and the emissions stuff ( CA models.) Twforo or three for accessories.

The wires do go through the inner fender, where there is a sharp-ish edge, and then into the headlamp protector, both of which could rub the wires and beak the conductors.

Some wires change color when they go through the connectors behind the glovebox. A good wiring diagram will help to know which.

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thanks for the input guys. I have the FSM from a '76, and am pretty good with a meter and a wrench. the '76 wiring is the same as the '77, according to what i'm looking at in the schematic and on the car 9i tried to download a '77 FSM, but my computer kept crapping out, got the '76 FSM easily) . there are no relays for the headlights. i was able to trace all of the wires except after the fuse box through the firewall (i didn't want to cut the loom's tape that holds it all together). where all the large harness connectors join.

a local guy mentioned that the CA cars have an orange sticker on the ECU. is this true? mine is orange/brown-ish.

also, i have the dash out, but re-installed the harness, just so everything is hooked up. the lights worked fine with the dash out, and all ancilliary lights work. then yesterday, the headlights just quit. i also cleaned all fusable link contacts, headlight sockets and connectors inside engine compartment. also note that the car is original and unmolested...very stock, no birds nests of wire anywhere. thanks

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the '76 wiring is the same as the '77
Maybe in the lighting circuit but there are differences in the rest of the car. I'd keep trying to get the 77 manual if I were you.

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I'm going to make use of my torpedo heater this winter to see if I can straighten out the mess of wires behind my radio. I wonder if you could get a photo of the wiring back there? (the wiring & plugs for the radio, hazard, defog switches.)

thxZ

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hey tomohawk: sure...give me a minute to tidy it up a bit for a pic.....

WHAT THE F@*K!...just tried my HL's...my lights are working fine. this sort of blows..because i don't know what the problem was..last night i left it in a 'gave up for today' attitude..

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sblake01: thx. i found some diff's between 76 and 77 already :o)

tomohawk: hope these help....wait, the attachment paperclip isn't working..any advice?

-blue 'T' plug is for defogger.

-black, red (fused) single lines are for radio pwr.

-antenna sw. is hooked up and laying on radio...which is laying on newly carpeted floor :o)

-speakers are self explanitory.

-lights for vent panel and console are hooked up except for wiring to ashtray light, which is on the console....which is on the roof of my 240 :o)

-large 5 wire black plug???? your guess is as good as mine...

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for those still following this post...i found the problem!. the large spade ground wire under the combo switch harness connectors (top of steering collumn under ignition lock cylinder) wasn't properly connected. the male spade was slid in between the outter female receiver, and the clear insulation 'boot' of the spade connection, thereby giving intermittent contact.

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Like I always say: The problem is ALWAYS simple... Finding it is the hard part. Those clear covers were put on ther for a purpose, I'd say.

Just glad you found your problem! :D

thxZ

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...funny thing was that it pi*@ed me off for so long i wasn't even happy when i found it...i was more like..."it's about frickin' time!"..LOLOL but yes.i'm happy now.

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7277-

Thanks for the pics. I couldn't tell very well, but it looks like the wiring going to the hazard switch & defog just go go under the fan somehow? Mine were covered by the rug ( an ugly bulge and not good for connectors) so I thought I could run them under the heater somehow.

thxZ

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Anyone have an actual wiring diagram that would work on a 280z. Having headlight issues, but can't fathom paying $24.00 plus shipping from the ebay robbers!

thanks

Mark

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Find the FSM at carfiche.com.

Though he didn't state the year of his car, according to his profile it's a 78. Carfiche doesn't have a 78 wiring diagram. There are some important differences between the 77 that they do have and the 78. I tried to attach the 78 wiring diagram here but apparently it's too large, about 3.5mb. According to the guidlines it should work but it doesn't.

markur, I could try emailing it to you. In fact I can send you the entire 78 FSM in four seperate emails ranging from about 13 to 18 mb each if your email will accept messages that large. Some will, some won't. Send me a pm if you're interested.

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It turns out I have a gif of a 78 wiring diagram. I'm trying to figure out how to upload it to this site.

Edit: Well, I uploaded it to my gallery as a ZIP file. Maybe it will be available for downloading from there.

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I'm still having trouble with my lights too. Its very irritating, It seems that the high beams work but the low beams don't. it doesnt seem like the power is getting to the combo switch to get it working on low beams. Am I missing something?

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I'm still having trouble with my lights too. Its very irritating, It seems that the high beams work but the low beams don't. it doesnt seem like the power is getting to the combo switch to get it working on low beams. Am I missing something?

Have you ensured you have continutity going through your high/low beam switch for your low beams? If I am reading the 78 wiring diagram correctly, you should have continutity between pin 16 (red wire with a blue stripe) to pin E.

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No I dont and I can't figure out why. I've got power going into the fuse box and from the switch that turns the parking lights and head lights on but none to the switch that switches the highs and lows. I also have the Hazard switch disconnected because that needs a rebuild. Will that hurt anything?

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Christian, is it drivable in the daylight? Feel like driving down to Springfield later this week or this weekend? I bet we could track this down in fairly short order...

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