Mystery to me wiring harness

[dodgemahal]

I'm restoring a 1973 4 door Dart Custom. There is a 2-wire harness with a connector at the end that's under the carpet and just to the right and adjacent to the transmission hump. What does this connect to?

 

[Mike69cuda]

How about some pictures?

 

[jos51700]

Butt detector in the seat for the seat belt warning?

 

[dodgemahal]

I'll get some pictures tomorrow. Im pretty sure there's no connector on the seat. There's wiring going to the seatbelts that are attached along the door openings. They trigger the dash light.

 

[dodgemahal]

Yellow ring is where it's located. The other photo is with the carpet pulled back.

 

[rbkt65]

Usually pink and white wires indicate lighting. that is probably console pigtail.

 

[dodgemahal]

Usually pink and white wires indicate lighting. that is probably console pigtail.

Brilliant! That makes perfect sense. No console here, with a 4 door. Thanks!

 

[72RoadRunnerGTX]

As mentioned, that’s seat belt warning related, red and grey wires for the right seat weight sensor switch. The switch may have been removed from the seat cushion springs if not able to locate the seat wires.

 

[dodgemahal]

Good to see that diagram. I have no seat cushion wiring. Only in the retractors. Thanks much.

 

[dodgemahal]

Okay, now I feel like an idiot. I looked at my bench seat, which has been out of the car for 2 years, and to my surprise it does have a weight triggered switch. How do all these components work together? I assume the dash light stays on until the seatbelts are buckled. Does the passenger weight cause the right retractor to open the circuit to the dash lamp? I'm fuzzy on this.

 

[72RoadRunnerGTX]

Okay, now I feel like an idiot. I looked at my bench seat, which has been out of the car for 2 years, and to my surprise it does have a weight triggered switch. How do all these components work together? I assume the dash light stays on until the seatbelts are buckled. Does the passenger weight cause the right retractor to open the circuit to the dash lamp? I'm fuzzy on this.

Basically, for this year, power for the warning system comes from ignition1 (key run position only) routed to the seatbelt relay and one side of the buzzer/light. The relay primary is triggered by a ground from either the parking brake switch(manual) or the NSS (automatics). The normally closed relay completes a ground path, when the parking brake is off or not in park/neutral, to the retractor switches wired in parallel (closed with the retractor fully retracted) with the right seat weight switch open without weight to remove the right retractor switch from the circuit when the seat is not occupied. Key on, parking brake off or in gear for autos, driver’s retractor not extended equals warning lights and buzzer. Right seat occupied includes the passenger retractor.

 

[jos51700]

Those are almost always the butt sensor. I always saw the console lighting wiring coming from up under the dash with the weird angled connecter. Maybe it changed on early/late cars?

 

[dodgemahal]

Basically, for this year, power for the warning system comes from ignition1 (key run position only) routed to the seatbelt relay and one side of the buzzer/light. The relay primary is triggered by a ground from either the parking brake switch(manual) or the NSS (automatics). The normally closed relay completes a ground path, when the parking brake is off or not in park/neutral, to the retractor switches wired in parallel (closed with the retractor fully retracted) with the right seat weight switch open without weight to remove the right retractor switch from the circuit when the seat is not occupied. Key on, parking brake off or in gear for autos, driver’s retractor not extended equals warning lights and buzzer. Right seat occupied includes the passenger retractor.
View attachment 1716493590

That is a fantastic write-up. I'm going to print it and frame it and hang it on the wall. How do you know all of this? You must be nerdier than me. I got it now, thanks to you. I'm doing a factory OE resto and I want everything to work as it did when it left the factory.
To Jos51700: you were right and I feel silly now. I just don't remember disconnecting that seat connector(maybe it was already disconnected).

 

[jos51700]

That is a fantastic write-up. I'm going to print it and frame it and hang it on the wall. How do you know all of this? You must be nerdier than me. I got it now, thanks to you. I'm doing a factory OE resto and I want everything to work as it did when it left the factory.
To Jos51700: you were right and I feel silly now. I just don't remember disconnecting that seat connector(maybe it was already disconnected).

Don't feel silly. You gotta live this stuff every day to get the answers the REAL Mopar guys can come up with. "Oh that's '67 only trim because it has three holes instead of four"
I only thought about it because I've been thinking about using a horn switch from a late model steering wheel under a door mat so my doorbell goes off whenever someone walks up my walk, and I thought about using the butt detector first.

 

[72RoadRunnerGTX]

To be clear, the seat switch used for this application are not “pressure” sensitive, they don’t respond to direct compression. They clip to a seat spring and detect the flex of the seat spring downward as weight is applied, contacts close when the strip switch is flexed out of its normal unweighted position.