700r4 Lockup light - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kaycee · 09-17-2021, 08:07 PM

So I put in a TCI lockup kit have it wired to lockup in 4th only ,red wire to brake switch and onto the switched fused panel. Was working great no problem,but the other night I dont think it was locking up ,would ride the brake and watch the tach and no difference in rpms. So I was wanting t run a light so when the lockup kicks in the light will come on or off. How do I accomplish this I have a green wire that is not in use but can be used for an optional on/off switch can the light be used instead of a switch ??

Bigdav160 · 09-20-2021, 10:30 AM

How is the CC being controlled now?

I once wired a bicolor LED and a couple 1000 ohm resistors into the converter control wire to give me a visual indicator if the transmission was getting the command to lock the converter (computer controlled)

kaycee · 09-20-2021, 10:26 PM

It is through the vacum switch that TCI supplied

**pjmoreland** · 10-29-2021, 03:38 AM

You could hook up a light like the Dorman SO13650. You'd connect the light's negative lead to that green unused wire from the transmission plug terminal B, and the light's positive lead to the red wire running from your brake switch to the transmission plug terminal A.

https://www.autozone.com/lighting/in...ght/973146_0_0

kaycee · 10-30-2021, 10:16 AM

Appreciate the advice on the hookup, wiring is not my cup of tea I make it to complicated lol.

**pjmoreland** · 10-30-2021, 10:29 AM

The light gets hooked up in parallel with the TCC solenoid so the light turns on when the solenoid is energized. It's convenient that the green wire is available. You could add the light and still connect the green wire to a switch for manual control, if wanted.

kaycee · 11-01-2021, 08:17 PM

Can I run this without the vacum and just pug it off,I hook vacum up and it jumps in and out of lokup. I have tried several time sto adjust but nothing seems to work, only turn adjustment screw 1/8 turn at a time ?

**pjmoreland** · 11-01-2021, 08:43 PM

One vacuum switch does not work well. I have tried it and had the same experience you're having. You could just replace the vacuum switch with a manual toggle switch. I would connect the toggle switch to the wires that were used for the vacuum switch. That way it will only lock up in 4th gear.

67 Burb · 11-02-2021, 11:03 AM

Quote:

Originally Posted by pjmoreland

One vacuum switch does not work well. I have tried it and had the same experience you're having. You could just replace the vacuum switch with a manual toggle switch. I would connect the toggle switch to the wires that were used for the vacuum switch. That way it will only lock up in 4th gear.

If you are not using a vacuum switch, what happens when you are passing or pulling on a steep grade and need the TCC to unlock? Will the tranny kick down into third then?

I'm trying to get my 200-4R TCC to work properly using the same connections shown in the schematic in post #4.

**pjmoreland** · 11-02-2021, 11:07 AM

Quote:

Originally Posted by 67 Burb

If you are not using a vacuum switch, what happens when you are passing or pulling on a steep grade and need the TCC to unlock?

It forces you to handle the situation manually. You either have to shift into 3rd, or you have to flip a manual unlock switch on the dash.

**pjmoreland** · 11-02-2021, 11:14 AM

I've been working on a better solution for TCC control for awhile. My current setup uses two vacuum switches and a delay relay to get rid of the on-off-on-off cycling. It works pretty well, but it still has the problem of keeping the TCC locked at too low of a speed, which lugs the engine. My current setup can be found on post #35 of the following thread.

https://67-72chevytrucks.com/vboard/...=822382&page=2

I am working on an Arduino-based solution at the moment that monitors engine vacuum and vehicle speed.

In my opinion, the best commercially available solution is the speed-based system from B&M. It's pricey though.

Rick Bollinger · 11-02-2021, 09:24 PM

I put the B&M kit on mine. I ran it through a brake switch for a truck with cruise control so that it would power the unit until you hit the brake then it would cut power and unlock the converter. You can adjust the speed that it locks up. When I get my truck back together I want to hook in a vacuum switch in series with the brake switch so when I pass it will unlock and not have to do it manually.

09-17-2021, 08:07 PM	#1
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,445	700r4 Lockup light So I put in a TCI lockup kit have it wired to lockup in 4th only ,red wire to brake switch and onto the switched fused panel. Was working great no problem,but the other night I dont think it was locking up ,would ride the brake and watch the tach and no difference in rpms. So I was wanting t run a light so when the lockup kicks in the light will come on or off. How do I accomplish this I have a green wire that is not in use but can be used for an optional on/off switch can the light be used instead of a switch ?? __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

09-20-2021, 10:30 AM	#2
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 700r4 Lockup light How is the CC being controlled now? I once wired a bicolor LED and a couple 1000 ohm resistors into the converter control wire to give me a visual indicator if the transmission was getting the command to lock the converter (computer controlled) __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

10-30-2021, 10:16 AM	#5
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,445	Re: 700r4 Lockup light Appreciate the advice on the hookup, wiring is not my cup of tea I make it to complicated lol. __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

10-30-2021, 10:29 AM	#6
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,319	Re: 700r4 Lockup light The light gets hooked up in parallel with the TCC solenoid so the light turns on when the solenoid is energized. It's convenient that the green wire is available. You could add the light and still connect the green wire to a switch for manual control, if wanted.

11-01-2021, 08:17 PM	#7
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,445	Re: 700r4 Lockup light Can I run this without the vacum and just pug it off,I hook vacum up and it jumps in and out of lokup. I have tried several time sto adjust but nothing seems to work, only turn adjustment screw 1/8 turn at a time ? __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

09-20-2021, 10:26 PM	#3
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,445	Re: 700r4 Lockup light It is through the vacum switch that TCI supplied __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327

10-29-2021, 03:38 AM	#4
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,319	Re: 700r4 Lockup light You could hook up a light like the Dorman SO13650. You'd connect the light's negative lead to that green unused wire from the transmission plug terminal B, and the light's positive lead to the red wire running from your brake switch to the transmission plug terminal A. https://www.autozone.com/lighting/in...ght/973146_0_0 Attached Images

11-01-2021, 08:43 PM	#8
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,319	Re: 700r4 Lockup light One vacuum switch does not work well. I have tried it and had the same experience you're having. You could just replace the vacuum switch with a manual toggle switch. I would connect the toggle switch to the wires that were used for the vacuum switch. That way it will only lock up in 4th gear.

11-02-2021, 11:14 AM	#11
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,319	Re: 700r4 Lockup light I've been working on a better solution for TCC control for awhile. My current setup uses two vacuum switches and a delay relay to get rid of the on-off-on-off cycling. It works pretty well, but it still has the problem of keeping the TCC locked at too low of a speed, which lugs the engine. My current setup can be found on post #35 of the following thread. https://67-72chevytrucks.com/vboard/...=822382&page=2 I am working on an Arduino-based solution at the moment that monitors engine vacuum and vehicle speed. In my opinion, the best commercially available solution is the speed-based system from B&M. It's pricey though.

11-02-2021, 09:24 PM	#12
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 284	Re: 700r4 Lockup light I put the B&M kit on mine. I ran it through a brake switch for a truck with cruise control so that it would power the unit until you hit the brake then it would cut power and unlock the converter. You can adjust the speed that it locks up. When I get my truck back together I want to hook in a vacuum switch in series with the brake switch so when I pass it will unlock and not have to do it manually.



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