"BELTS" Indicator Lamp???

Discussion in 'Classic Mustang Specific Tech' started by BlwnGazkit, Jun 19, 2007.


  1. BlwnGazkit

    BlwnGazkit Member

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    Hey guys, I must say I'm a little perplexed. I have a '68 Coupe that been mostly restored, this is my second one and I haven't gotten to the interior yet.

    Here's the thing, every now and then a lamp lights up on the dash indicating "BELTS" it goes off after a short while but I have no idea why it comes on. I've looked through the wiring diagrams and don't see a seat belt indicator anywhere. I've had the interior out of my other 68 and never saw a sensor for seat belts.

    So I guess my question is two part: 1) Anyone know if this is actually a seat belt warning lamp? and 2) If so, where is the sensor for it?
  2. 68stang351

    68stang351 Founding Member

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    Yay! My first reason to use my 68 wiring diagram manual I bought this weekend!

    According to the Convenience Systems diagram (#2-E19), your Belts indicator lamp should have a violet wire and a blue/red wire. I would trace the violet wire down. It should go into a 3 wire connector. The violet wire then comes out of the other end of the connector and should go directly to the seat belt relay. The seat belt relay has 2 prongs and a ground. It uses a 2 prong "L " shaped connector. Like this _| (kind of). The other wire on the seat belt relay goes to a 3 prong/1wire plug that goes to the ignition switch.

    It looks like the seat belt relay is under the dash also.
    That's all I can get from my manual.

    Did that help any?
  3. BlwnGazkit

    BlwnGazkit Member

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    OK, wow! Somehow I completely missed that page in my book!! I'll trace the wiring tonight and figure it out.

    I could've traced the wiring from the bulb in the first place I guess, but I'm lazy!
  4. 68stang351

    68stang351 Founding Member

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    Me too! That's why I bought the book. :D It's like the next to last page, if you have the same one I do.
  5. BlwnGazkit

    BlwnGazkit Member

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    Yeah, I just realized mine's out of order!! Lol, I've had it apart a few times to make copies of it. Plus I scaned it into a PDF file so I have it on my computer to.
  6. mr-fixit

    mr-fixit Founding Member

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    I am pretty sure the way it is supposed to work is this: You start the car, (or turn on the ignition) and the light goes on, it says on for a few seconds and goes out. It is just a reminder. Doesn't matter if your seat belts are coupled or not. If your's is coming back on, maybe it is temporarily losing power( through a bad connection) and recycling itself.
  7. BlwnGazkit

    BlwnGazkit Member

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    That's exactly whats happening, and yes thats the way it's wired.

    When the ignition is switch to "ON" the indicator switch activates and turns the lamp on. It's not a relay, it's a time delay switch. After being on for a few seconds it turns off.

    So for some reason the voltage level is dropping low enough for the switch to recycle itself. It's probably the way I connected the radio to the ignition. Ah well, it doesn't bother me right now so I'll fix it when I'm back in the dash putting in the new modern gauges...

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