HammerDown
Well-known member
Just finished rebuilding my 1981 TH350c
Before I install it back in the car, I noticed the outside plug that connects to the transmission has 3-wires > however, one of those three connect to nothing!
![Outside Plud with wires.jpg Outside Plud with wires.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7810-de78384ba35824c2c1de58c23ac0f439.jpg)
Note the case socket...(only two connectors)
Inside the trans pan, the lock-up solenoid is a 'two-wire' thus only two connect to the backside of the blue case-socket.
![case socket.jpg case socket.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7811-b1d9a7ba6b945863422dfb6a84c690fd.jpg)
![inside Plug.jpg inside Plug.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7812-3161c31715227c0cf2ef2777b65af953.jpg)
Below is my lock-up solenoid and inside wiring...those two plugs connect to a pressure switch, that does bench test with air.
![TCC solenoid.jpg TCC solenoid.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7813-8845ffd442bdee7bef9e42f0b85277e4.jpg)
Here's the thing > since having my car 'new', I cant' say I've ever noticed the RPM dropping at highway speeds...almost like the lock-up never really functioned as should.
And, seeing a three-wire plug, and noticing only 'two-wires' actually connect to inside the trans has me thinking...was it wired wrong from the factory?
Does anything above appear to be wrong, is there any way I can test the three-wire plug to make sure it's doing what it should?
Thanks for any info.
Before I install it back in the car, I noticed the outside plug that connects to the transmission has 3-wires > however, one of those three connect to nothing!
![Outside Plud with wires.jpg Outside Plud with wires.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7810-de78384ba35824c2c1de58c23ac0f439.jpg)
Note the case socket...(only two connectors)
Inside the trans pan, the lock-up solenoid is a 'two-wire' thus only two connect to the backside of the blue case-socket.
![case socket.jpg case socket.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7811-b1d9a7ba6b945863422dfb6a84c690fd.jpg)
![inside Plug.jpg inside Plug.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7812-3161c31715227c0cf2ef2777b65af953.jpg)
Below is my lock-up solenoid and inside wiring...those two plugs connect to a pressure switch, that does bench test with air.
![TCC solenoid.jpg TCC solenoid.jpg](https://forums.corvetteactioncenter.com/data/attachments/7/7813-8845ffd442bdee7bef9e42f0b85277e4.jpg)
Here's the thing > since having my car 'new', I cant' say I've ever noticed the RPM dropping at highway speeds...almost like the lock-up never really functioned as should.
And, seeing a three-wire plug, and noticing only 'two-wires' actually connect to inside the trans has me thinking...was it wired wrong from the factory?
Does anything above appear to be wrong, is there any way I can test the three-wire plug to make sure it's doing what it should?
Thanks for any info.
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