Interlock Safety Switch
I have a ’69 Dart 340, 727 automatic. When I bought it, it started and drove but had no backup lights and you could start it in any gear. There was no interlock safety. There was no wire harness off the transmission.
I found a junkyard 3 wire transmission harness and hooked it up per the factory service manual. Now the engine will not start. The starter is dead. With the key on (engine not running) I can put it in reverse and the backup lights come on but the starter is dead.
There is a wire (not factory) coming off the under-hood harness that was plugged into one of the wires that comes out of the bulkhead connector that would normally go to the transmission wire. I disconnected this non-factory wire so I could wire my new junkyard harness like in the service manual. Now it will not start even though it is set up like it is supposed to be. I can totally disconnect the new harness and plug in the non-factory wire to the bulkhead wire, and it will start and run but I have no interlock safety or backup lights.
The photo shows the non-factory wire shoved into the one of the two wires that would go to the transmission harness before I put the new harness in. It starts in this
configuration but I want the safety interlock and reverse lights.
Does anybody know what someone did to defeat the interlock and how I can put it back to factory?
I have a ’69 Dart 340, 727 automatic. When I bought it, it started and drove but had no backup lights and you could start it in any gear. There was no interlock safety. There was no wire harness off the transmission.
I found a junkyard 3 wire transmission harness and hooked it up per the factory service manual. Now the engine will not start. The starter is dead. With the key on (engine not running) I can put it in reverse and the backup lights come on but the starter is dead.
There is a wire (not factory) coming off the under-hood harness that was plugged into one of the wires that comes out of the bulkhead connector that would normally go to the transmission wire. I disconnected this non-factory wire so I could wire my new junkyard harness like in the service manual. Now it will not start even though it is set up like it is supposed to be. I can totally disconnect the new harness and plug in the non-factory wire to the bulkhead wire, and it will start and run but I have no interlock safety or backup lights.
The photo shows the non-factory wire shoved into the one of the two wires that would go to the transmission harness before I put the new harness in. It starts in this
configuration but I want the safety interlock and reverse lights.Does anybody know what someone did to defeat the interlock and how I can put it back to factory?
