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1974. the seat belt interlock. |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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Posted: Apr/04/2018 at 8:12pm |
Does anyone have the information to bypass this interlock system? my car isnt getting power to the solenoid to activate it. dont say its easy. because in my cars case, the original owner took the seat belts out, and the fasten seat belt light stays on even if the key is out of the lock cylinder. so I have issues that isnt normal. the starter has been replaced with a reman, and it works, and the solenoid I replaced last year, (with a blue streak one).... I also have the 1974 and 1975 TSMs. I am not good with wires. I hate wires. but I want to figure this out. I dont believe the ignition switch is the problem.
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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If I recall the interlock didn't stop power but supplied ground to the solenoid.
That's how the seat belt interlock and NSS are tied together in 73 - they supply starter relay/solenoid ground as there's a spade on the back unlike the earlier ones where the NSS blocked power to crank. At least 73 it's the solenoid ground that's controlled, not power to the solenoid.
I'd have to double-check the 74 diagram to see if it's the same as 73.. |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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Very late 73 has the interlock. you had to buckle the seat belt to activate the starter. late 73, 1974, and early 75 has the interlock system.... there was a legal bypass so you could start the car without buckling the seat belt, and the fasten seat belt light would remain functional. I think the logic module is my problem...
I also have the 1973 TSM. and the 1973 supplement, and its a very late supplement as it describes the interlock system, and the changes to the late 1973 Gremlin, which is basically a 1974 Gremlin. Edited by purple72Gremlin - Apr/04/2018 at 9:06pm |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11472 |
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Mine simply had the seat sensors unplugged when I got the car in 1977. If your bypass switch is intact (under the hood on the right inner fender) you can force the plunger down with the right size screw or bolt and leave it in place.
Or, you can figure out from the schematic which wires in that harness you need to permanently jump, and unplug that bypass switch. |
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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rev - is that bypass simply a relay that handles the solenoid ground circuit?
I'd have to check the schematics for that car and year but if I were to design such a system, I'd run the NSS circuit through the seat belt system using a relay - the NSS would ground the solenoid IF the seat belts were fastened, closing the relay circuit and allowing the NSS to ground the solenoid. The seat belts not fastened would mean the NSS circuit wasn't complete. A bypass could simply be a means to force the relay closed momentarily. That's a guess........... if I am correct then a blue wire from the NSS would be passing through that seat belt system. Anyway, that's how I would design it to keep it simple. I don't have the TSM handy to look at.
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billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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OK, just read that again - the stick didn't use the NSS to ground the solenoid. Then it's likely the seat belt relay closed the circuit for the S on the solenoid.
Key to seat belt relay - find that relay and connect the proper terminals - again, i'd have to look at the TSM schematic but it should operate in a similar way - except they feed the ignition switch S feed through the seat belt interlock system, a relay. That red button would bypass that relay.
So the solution would be simple - IF you knew which wires to jump - and if I had the TSM with me I could find that and draw it up. |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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Im going to look at the tsm again. been too busy. the relay in the engine compartment has a button on it. Im going to do more checking. and I need to make sure the ignition switch isnt the problem too.
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purple72Gremlin
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5454 |
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I have no idea what an AMC seatbelt override box looks like. But as a former owner of a 1974 Dodge Dart I do have some experience with Mopar. For them, you tie the two yellow wires together at the box and you are done. I opened the box up and internally connected the two to make it look clean but I'm kind of anal sometimes.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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