Continue to troubleshoot or start from scratch?

67Dart273, you may think its not true, but as Bill Cosby says the (PROOF IS IN THE PUDDING) i dealt with the above problem 6 months, the U.S.had white or Ivory, if you sat a bag of apples in the passenger side seat that weighed 40lbs or more , the car had a sensor under each person the belt had to be buckled, you could unplug them under the seat and not worry about the module, but you still had a switch on the inner fender that had 3 wires , all yellow, one with a black tracer that had to be wired on bypass in order for the car to start, if its not true ,go to ebay and you will see green modules, these were put on cars shipped to Canada, and automatically by passed the need for seat belts, the orange ones were put on cars shipped to Vezeuala ,also were no seat belt laws at that time, so Bl1zzard , if you don't beleive that ivory module controls 11 things by cutting the plugs off go for it, cut the plugs off and try to rewire around it, if its not true look at other threads on this site and you will see that the 75 and 76 dusters ,Chrysler done away with those modules because they caused so much trouble. All i have to say , IV'E BEEN THERE AND HAVE THE T SHIRT to prove it, one last thing if you use a different year model wiring harness , there is a little different at the bulk head, mine was the brown wire to the ballast and the yellow wire to the starter relay go out on different letters than the 74 model. I wasn't trying to say definely that seat beat module was your problem, just giving you an ideal of possibility of things to look for now and in the future should you have trouble,but you made mention in starting thread about some connectors handing down is the reason i added this thread, until you have wrestled with problems like this, sometimes we over look thing, i thought maybe previous owner had tried to locate a good seat belt module ,and couldn't find one , i went to junk yards and pulled a half dozen or more and all were white with corrosion, so if this helps fine ,if not maybe in the future it will , but i located 3 other people that posted about the dreaded seat belt module , same section as this Aug/2/19, july/22/19, june/18 2019, and that was just the people that posted, but if Ma MOPAR done away with them, on the 1975 model, thats proof enough to me that they were crap from the start.