Seat Belt Interlock Relay, Late 74-76’ - how does it work? Options

[Superhawk996]

For those of you that despise the seatbelt / starter interlock and the horrific screeching noise the seat belt buzzer makes - let me say I understand completely. As I’ve been playing with this on the bench my wife now hates the noise just as much as I do.

This thread is going to explain how it works and how to bench test it over the coming days.




Credit is owed to @JeffBowlsby , @Bdstone914 , and @Montreal914 for providing me with donor parts that will make this thread possible.

Eventually I will post the schematic of this ridiculous conglomeration of components. I hope to eventually put the circuit in LTSpice to help verify its theoretical operation. I make no warranty as to the accuracy of the schematic - this is just me satisfying my own curiosity.



If you have no interest in my personality defects that would lead me to take on this little project; ignore this thread.

If you have a late car with an in-op system and eventually want to get it working - this thread is for you.

Toward the end I’ll share some ideas on how to get rid of or to change that horrific buzzer noise.

[rjames]

Following
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I've thought about trying to reconnect it my '75 (was disconnected by the PO) just to see if it still works. I could do without a buzzer, but I think it would be kind of cool in a '70s sort of way to have the fasten belts sign light up with weight on the seat.

[Root_Werks]

Following
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I've thought about trying to reconnect it my '75 (was disconnected by the PO) just to see if it still works. I could do without a buzzer, but I think it would be kind of cool in a '70s sort of way to have the fasten belts sign light up with weight on the seat.

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My 75' was already hacked up in a bad way. Wound up removing all the wires associated with the system including the ones up to the belt lock (replaced the stickers, why not?).

Would be sort of cool to have it functional. That old school 70's buzzer.

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