Author Topic: 700r4 original wiring diagram  (Read 25441 times)

Offline Hotrod Steve

  • Newbie
  • Posts: 8
Re: 700r4 original wiring diagram
« Reply #15 on: August 04, 2011, 09:20:02 pm »
Hello

The easiest way to hook up the lock up converter.
Run a fused hot wire to break pedal switch, it's a two way one contacts for the brake pedal are N.O.
The contacts for torque converter are N.C.
From the switch go to vacuum switch then to trans. Use a turbo 400 case connector it's a single wire.
In trans throw away all the pressure switchs, Get a N.O. pressure switch.
When trans shifts into 4th the pressure circuit will close switch that will send voltage to T.C. solenoid to dump
trans fluid to apply lock up .
The end of the input shaft feeds trans fluid to torque converter to pull off lock up clutch.
go to wrecking yard and look for wiring and brake switch .
Have fun. I've done about 50 trans this way.   

Offline williebm3

  • Newbie
  • Posts: 46
Re: 700r4 original wiring diagram
« Reply #16 on: August 05, 2011, 10:17:47 am »
Trying to post pics and it will not allow me to. Can I email them to someone and have them try to post them for me?

Offline 1979C20

  • Senior Member
  • ****
  • Posts: 1659
  • Kyle Taulton.
Re: 700r4 original wiring diagram
« Reply #17 on: August 05, 2011, 02:19:56 pm »
sure,  let me know when you send them so I can remove my email from this post.
« Last Edit: August 05, 2011, 08:56:49 pm by 1979C20 »
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline williebm3

  • Newbie
  • Posts: 46
Re: 700r4 original wiring diagram
« Reply #18 on: August 05, 2011, 07:43:20 pm »
Just sent them to you. Thanks.

Offline 1979C20

  • Senior Member
  • ****
  • Posts: 1659
  • Kyle Taulton.
Re: 700r4 original wiring diagram
« Reply #19 on: August 05, 2011, 09:19:30 pm »



Here are the ones you sent me.
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline williebm3

  • Newbie
  • Posts: 46
Re: 700r4 original wiring diagram
« Reply #20 on: August 05, 2011, 10:52:23 pm »
The first picture is of the wires that were cut by PO. These are the 2 that I have been told that I need. But, I do not know where to go with them and if they are the right ones. Have the plug in for the tranny and an extra vacuum switch if need. Now just need to know how to hook it up. Thanks in advance for any help.

Offline williebm3

  • Newbie
  • Posts: 46
Re: 700r4 original wiring diagram
« Reply #21 on: September 01, 2011, 09:28:26 pm »
OK. Went to junk yard and pulled entire harness from wrecked truck. Where does the light green wire plug in under the dash or does it. I could see that the light blue went to a wire(can't remember color) up under dash and PO had not disrupted this either. Lt green was not plugged in on wrecked truck either, but also was not plugged into tranny.
Also, where does the red 2 wire plug go down around tranny?