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Hello all and thanks for allowing me to join the forum. I have an issue with my MK3 Supra in that I have a few connectors that seen to have no home. The car has been working okay until I needed to change the cylinder head gasket. Did a strip clean etc. I have 2 connectors that don’t seem to go anywhere. The car has been messed about with but the engine was running although I think the engine harness is not original. I have attached 2 bad photos in the hope that somebody can help. I am now having issues getting the engine to run. It will start and run for a few seconds and cuts out. It’s a 3.0 turbo. Any help appreciated

What transmission do you have? The first pic (on left, more square than rectangle) looks like the ABS connector for the R154. No sure on the other one but may also be a transmission connector - reverse light maybe?

 

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Do your backup lights work? How about does the car start with the clutch out? Could be related on that front as well if its a manual swap car.