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1979 K10 SWB "Jolly Green Giant"

Sometimes I change things
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My thought is light connected in series would tell me that the circuit is completing itself. I am not sure that it is even receiving ground right now. Because it is the 90 model with ecu control, I think that I may have to ground the D terminal to complete the circuit. I am also looking at swapping in the complete TBI engine with the factory harness and ecu at a later date, so I am trying to get lockup without modifying the original internal trans wiring. I guess I can pull the pan again and take some pictures of wire routing. Maybe there is a simple change I can make to get me going, then change it back once the TBI and ecu go in...
 
I'll try and check tomorrow but we might have an engine for the jeep. IIRC we have one that was rolled and another that was impounded and never released.
 
You could have looked at them yourself if you wouldn't have skipped out on the concrete job we needed you for. :D
 
I'd drive the 216 miles up there just to check out your trucks. If there is an emgine to make my wifey happy, even better.
 
hmmm
I'm no good with the TCC issue. I have an '89 with a BTO kit that gives me all the wiring and internal pressure switches I need. Trans locks in 4th only though. No issues thus far.
 
IIRC, my '70 has a '90 700R4. I have it wired with power and ground with the 2 pins towards the outside, or away from the trans case.
I think that I put the power on the front pin, but I don't know for sure.

So bottom line is, I'm not much help...

But if you get it to lock, you will know when you let off of the gas, since it will have act like a manual trans.
I can lock mine is all but 1st gear. I just have it on a switch.
 
So I grounded the D terminal on a switch and drove it to work again today. I can definitely tell that there is lock up now.

With only a few miles on it, seems like lockup can happen in any gear.

Best that I can understand, the B terminal is connected to the 4th gear switch, and would ground out a wire from the ECU in the factory set up.

Now I am thinking that I could use that wire to ground a relay, which would activate the circuit, giving me lockup in 4th only and eliminating to need to fuss with any internal wiring.

Am I crazy, or would this actually work?
 
Justin V said:
So I grounded the D terminal on a switch and drove it to work again today. I can definitely tell that there is lock up now.

With only a few miles on it, seems like lockup can happen in any gear.

Best that I can understand, the B terminal is connected to the 4th gear switch, and would ground out a wire from the ECU in the factory set up.

Now I am thinking that I could use that wire to ground a relay, which would activate the circuit, giving me lockup in 4th only and eliminating to need to fuss with any internal wiring.

Am I crazy, or would this actually work?
Click to expand...
I'm not up on what you used to set up the switch, but I have a TCI kit but I never hooked up the vacuum signal to activate the TCC. I just use the switch that I turn on and off. Anyway, it will lock up in any gear but 1st.
 
mrk5 said:
I'm not up on what you used to set up the switch, but I have a TCI kit but I never hooked up the vacuum signal to activate the TCC. I just use the switch that I turn on and off. Anyway, it will lock up in any gear but 1st.
Click to expand...
I simply ran power through the brake switch and into the A terminal, and ground out of the D terminal through a toggle.
 
As for the lockup, it definitely helped in the cooling department. Saw a minimum of 30 degrees cooler across the board. Some areas were 60 degrees cooler on after the same drive home.
 
Justin V said:
For plug and play it has tobe a 2000 and up XJ...
Click to expand...
Ok. That narrows it down to one possibility. I know one of them is older but I'm not sure on the other? It might be what you need though. The dude was moving from Alaska and had it crammed full of stuff from the front to the back. I think that's what saved him.
 
Justin V said:
As for the lockup, it definitely helped in the cooling department. Saw a minimum of 30 degrees cooler across the board. Some areas were 60 degrees cooler on after the same drive home.
Click to expand...
Yeah it amazes how quickly the trans will cool down with the lockup engaged.
 
Justin V said:
So I grounded the D terminal on a switch and drove it to work again today. I can definitely tell that there is lock up now.

With only a few miles on it, seems like lockup can happen in any gear.

Best that I can understand, the B terminal is connected to the 4th gear switch, and would ground out a wire from the ECU in the factory set up.

Now I am thinking that I could use that wire to ground a relay, which would activate the circuit, giving me lockup in 4th only and eliminating to need to fuss with any internal wiring.

Am I crazy, or would this actually work?
Click to expand...


Tested today and the B terminal is closed only in 4th gear. All other gears it is open.

So here is what I am going to do.

Key-on fused power directly to the A terminal on the trans connector.

D terminal will route through the switched portion of a standard 4 terminal relay, into the brake switch, and then to ground.

The power to the relay will be fused, and ground for the realy will come from the 4th gear switch (B terminal on trans connector) and also a toggle switch in case I am pulling a hill heavy and want to use 3rd gear lockup.
 
After a 45 mph maximum 2 mile drive, all seems to be well.

Tomorrow I'm taking the family on a scenic mountain cruise in the monthly payment.

Might not drive TPIR for a day or two...
 
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