Another Silly Interlock Question

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Red_Duster

Red_Duster

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Good evening all. New member but long time lurker for multiple Mopar builds with my father, but attempting my first one on me own. 1974 Duster 440 former drag car I’m putting back on the street.

My question is in regards to the interlock. I’m completely wiring the car (not my strong suit but I have the chassis manual) Tailight harness is done, working on the engine harness and then tackling the dash harness. Took me a while to figure out the T plug for the interlock reset since I’ve never worked on a ‘74. I have a ‘70-‘72 dash harness without the interlock junk. If I use that, can I cut and tape off the reset and will I run into any problems? I assume everything else is the same at the bulk head connector, right?

Thanks in advance fellas.
 
What the heck is an “interlock?”

One second you are talking about wiring for tail lights then dash.

Seat switch? Steering column? More specific please.
Good luck
 
I see how I jumped around there. I’m talking about the seat belt interlock. From my understanding it was only available on 1974 and some ‘75s before Mopar pulled it.
 
Okay-

I believe you just jumper the two wires together. Check the wiring schematic and verify operation to see if leaving in plugged or plugging together is what’s needed.
 
There are a couple experts on the site. Do a search on seatbelt interlock and you will find a lot of info.
 
TF360 said:
There are a couple experts on the site. Do a search on seatbelt interlock and you will find a lot of info.
Click to expand...

Thank you guys. Yes, I’ve searched it and found a few of the bypasses, but I haven’t found my unique situation where my engine harness has the reset but dash/interior harness doesn’t have the interlock. Really hoping that doesn’t cause problems down the road.
 
Red_Duster said:
Thank you guys. Yes, I’ve searched it and found a few of the bypasses, but I haven’t found my unique situation where my engine harness has the reset but dash/interior harness doesn’t have the interlock. Really hoping that doesn’t cause problems down the road.
Click to expand...
Seat belt inter lock is 74 only. It was so unpopular it was dropped after that year. Everybody that had a 74 just left the seat belt bucked and sat on the buckled belt
if they didn't use seat belts.
 
Assuming the wiring was original, there is/ was a push button reset box under the hood. It interrupts the "yellowish" wires feeding the starter relay. Splice those together is all you need

If you are playing with off-year harnesses, you need to do a wire by wire trace to make sure "what you have.
 
67Dart273 said:
Assuming the wiring was original, there is/ was a push button reset box under the hood. It interrupts the "yellowish" wires feeding the starter relay. Splice those together is all you need

If you are playing with off-year harnesses, you need to do a wire by wire trace to make sure "what you have.
Click to expand...

That's what I was afraid of. I do have the '74 dash harness as well, I was just hoping to avoid the interlock system all together and not have to worry about it.
If bypassing is as simple as splicing the yellow wires, can I splice them and remove the reset button entirely? Thanks for all the feedback everyone.
 
Yes. And you should be able to unplug the under-dash box as well
 
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