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Help Identify this part! Need Your expertise!


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Maybe Horn Relay is the horn button mechanism.  The switch shown is a manual switch, releasing power from the fuse panel to the horn and back to the combo switch through the coil shown.  Can't find a Horn Button on the diagram.

Your best bet is to just check for power at H on the fuse panel, then probe the parts at the horn button area for power.

SteveJ probably knows.  A title change might catch his eye.  Others might know also.  My horn has always worked and I have a 76.

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2 minutes ago, NVZEE said:

Didn't mean to scare you off but tracing a wonky circuit can test your comfort level and spirit of adventure. These things are good to be familiar with, just in case something leaves you stuck somewhere.

Found another diagram that shows the basic components: 

Much better but is that for 1972?  My snippet was from what's supposed to be the 1972 BE chapter.  The fuse panels are different so that should give a clue.

 

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Great info all! I plan to stop by the z shop shortly to try a couple of your suggestions, I'll let you know what I learn. 

Sounds like the first order of business is to assess power. So I'll try getting the horn to work with screwdriver first, then if no luck check connection and fuse box. If still no luck, sounds like I may have become an electrical sleuth and try my luck at the diagram. 

All of this information and postings gives me a great place to start! 

Im off on another z adventure! 

Z u later! Thanks! 

K

The lil z lady! 

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Hi gang, just wanted to update and thank all for your horn help :) 

Actually, nothing quite yet to report, as I'm still knee deep in getting my paint work completed, then she heads for Upholstry, after that I'll be tackling the mechanical issues, including my horn gremlin! I'll keep you all posted as soon as I get to the mechanical items. 

As of yesterday my girl is getting ready to put her makeup on ;), see below...

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Edited by KiraK
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Ut ooh....

Found a little cancer on my girl! The first time! Most of the damage around the upper right tail light, as seen in pictures. When sanded and removed, Had a small break through in the deck top. Left side had just a tad bit of corrosion, so  removed factory caulking and sanded and sealing that area as well. 

1st photo: Left side corrosion on deck lid. 

2nd photo: Right side deck lid after cleaning. Showed small break through in sheet metal. :( That's the worst of it.

3rd photo and 4th photo: Right side rust above right tail light, extends towards the license plate. 

Body man spent the day removing and making proper repair. 

Have since moved forward with the next paint step. 

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Just out of the paint booth! Not yet sanded and buffed. She's currently on her way to upholstry for a full clean, seat repair, antenna, install of soundproof padding throughout... Too much to list. I'll keep you posted as the progress continues! :) 

Such fun!

K

The lil z lady :) 

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It's looking good, KiraK. When you're finished with the refresh, you'll have to take it over to Cars and Coffee in Henderson one Saturday. I'm going to be bringing mine soon, and I've seen a couple of other S30's there in the past two weeks. Anymore, and we'll be able to start a local club! (lol)

 

Mike

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Love that you posted me on this! I've been looking for a z get together here in Vegas! 

Looks like all past clubs are defunct.

So sad!

I would love to come!

Can you send me location information and dates of get together? Also when you plan to go, and I'll make sure to try and coordinate my calendar! 

Your right, maybe we could get some club momentum going? 

I have become online friends with Brian May, he is the president of The Mid-West Z chapter... I think that's his club? Anyway he's very knowledgeable and can surely give us some direction regarding how to get a club started. 

I also recently met a Mechanic shop owner who specializes in Z's although they tend to do some pretty wild things to them, but amazing work none the less! He's also very knowledgeable and knows many of the older z folk in the valley who were active at one time. 

Anyway, point is, I think there could be some interest if someone could just start the process!

Lets chat! Lmk about the get together, and we can discuss. 

Z u soon! 

K

The lil z lady :) 

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Ok z friends, an update on my horn finally, and getting this thread back on track...

 (I apologize for derailing this thread slightly by posting pictures of my z's progress, just having so much fun and wanted to share with those I know feel the same way. ) 

Ok back to the horn. It's getting power, the horn will beep, then stop. My mechanic, a knowledgable z man, thinks my horn mechanism under the pad, is worn and needs to be replaced. Sigh! 

So im back to square one it seems. So I guess I'm in need of the whole horn mechanism. Can anybody offer any help on how to find one? 

They come up on eBay rarely, and when they do, they are usually expensive. I haven't found them on any of the z specialty on line parts stores either.

So, where to look? Does anyone have one they don't need? I'll keep watching eBay, but if anyone has any suggestions, I would gladly welcome them! 

Thanks to all for previously weighing in with your thoughts and comments.. Now that you have helped me have claify the problem, I now know I need a new horn mechanism/assembly.

For reference: 1972 240z

Share your expertise my friends! 

Thanks much,

K

The lil z lady :) 

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 Have you tried bypassing the horn switch? Temporarily connect the horn to the battery with a jumper wire to be sure it functions properly. That would eliminate a bad horn as a possibility. 

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19 hours ago, KiraK said:

Ok back to the horn. It's getting power, the horn will beep, then stop. My mechanic, a knowledgable z man, thinks my horn mechanism under the pad, is worn and needs to be replaced. Sigh! 

There's not a lot to the "mechanism:".  A spring holds one metal piece away from another metal piece.  When the two metal pieces touch, the horn beeps.  If it beeps it should keep beeping.  Was your mechanic really focused on it or did he just make an offhand comment?  

And how was he making it beep?  Not really clear that you had the complete assembly together and were pushing it as a normal horn button, or doing something else.  I thought your horn button was falling apart anyway.

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As Zed Head says under the horn pad is just a spring loaded sandwich if you will, that connects the circuit to ground. A simple emery sanding of the plated should fix that. 

Also on the back side of the steering wheel is a spring tensioned contact that rides the outer ring on the wheel. This is how the signal is passed to the harness in a way so you can turn the wheel and not be twisting a wire, those contacts also need to be cleaned / sanded / filed. Might need to pull the wheel to get at the back side. 

I suspect that is the problem. As you can see on the wheel in the pictures it gets corroded and loses the contact. This contact is connected through the three prong terminal going to the turn signal side of the switch. The Red/Black wire can be checked for continuity to the sandwich plate as the horn button is pressed. 

I wouldn't expect you would need to buy any parts to fix this unless one or more of the above pieces is broken or missing. It should just need cleaning. 

My 2 cents.

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Hi Mark, and Zed! 

Thanks for weighing in! Mark, good idea, and thinking perhaps that is the next step. 

Zed.. No, I was there when this happened, it would beep, then stop when pushed? As for my horn pad, there was a crack I. The interior plastic, but I did repair it, so I'm thinking that should no longer be a problem. So if I understand, are you saying that perhaps I only have a bad spring? If so, where can I find a proper replacement? 

Thoughts all? Appreciate the continued support!

K

The lil z lady :)

p.s. Getting ready to show her at the LA Z Bash on Friday!  I hope I can complete all the last minute prep before I go :) ! 

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I think that Mark went directly to what might be the real problem.  What you described is an electrical circuit that is made, then broken for no apparent reason.  If you make the contact by pushing the horn button, what causes it to go away?  You didn't let up on the button.

And Terrapin's pictures show what is even more likely, I think. Rusty, dirty contacts will open up as they heat up from current flow.  That contact is supposed to be always made, even as the wheel turns.  I think that you could check that one by pressing the button and turning the wheel.  You might get several beeps or it only beeps in one spot.  I had that problem on a Pathfinder, the contact had just worn away.  240,000 miles on it.  It was a different design but had the same purpose.

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Terrapin you are always so helpful and knowledgeable! I appreciate the photos! The front contacts look good.. Not corroded at all! But I haven't pulled it apart or looked at the back side. I also was not there when my z guy was troubleshooting, so I'll have to ask if he pulled it apart? I was just there at the end when we tried to honk the horn. 

So I will try cleaning next, then, if not successful, I'll try Marks suggestion to make sure the horn itself is working properly with no shorts. 

Am I on track with the above suggestions?

Pulling the mechanism apart before I leave for the z show unfortunately might not happen, as I am tackling several last minute updates since the z has had a complete tune up, paint. We are finishing putting all the peices back on the z... Bumpers, louvers, etc in preparation for the show. I'm having the A/C repaired this morning, and that is taking more time then thought, so all the other things planned for today are delayed. Sigh... U know how it goes when there is a deadline. I'll keep u all posted on my progress and come back with any additional questions. 

If interested, I plan to post photos after the z is completed and ready to roll :) 

Thanks again to all for helping to walk me through this particular issue. 

K

The lil z lady :) 

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Yes, I agree Zed, the above posts and your discription of the problem in your pathfinder make sense! 

So now I know what I need to try next. I'll also ask my z mechanic if he pulled it apart and checked. As I said I wasn't there until the end. 

Mill keep u posted and let you all know what I learn, what works, and what doesn't work.

Thanks much Zed!

K

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I would venture to say that if you heard the horn even if just a short bit, says it is working. I would look to the wires and contact areas for a inconsistent connection.

I happen to be cleaning up some switches today myself and your problem seem to fit todays activities. 

Hope you do not encounter any further hiccups in your reassembly today. Have fun at the Z show!!!

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Wish u were here, we could tackle this together, since it does sound like we are tackling similar problems! Misery loves company :) ! 

Your right it does sound like an inconsistent connection. I'll give it a go, and see how things work out! 

Hope your project goes well too! 

I will post some photos from the show. It is my first and it should be a blast! 

K

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You can always remove the horn pad and activate the horn mechanism by hand. Use a glove if you are worried about current but it shouldn't hurt since it's 12 volt. It may be the broken horn pad is causing the issue...

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Horray! Fixed! Just a connection issue.... Now I can roll down the road and honk to my hearts content! 

Thank you all for all of the ideas and feedback! Once again the community prevails!

Appreciate you!

K

The lil z lady :) 

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