Thread: Lockup Converter Wiring ?

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I think I know the answer to this but can’t find a wiring diagram to verify it.

I have a TH 250 with lock up converter (84 El Camino) it has a 4 pin square plug on the transmission. Although there are 3 wires going to the plug on the harness, only 2 pins on the transmission plug are wired. I assume one pin is hot and the other is ground. Can anyone verify this or point me in the direction of a wiring diagram?

the front wire is 12volt + the rear is ground .

As mentioned above, the TV cable installation and adjustment is critical. Improperly done, the transmission will not shift correctly and you may destroy the transmission under certain conditions.

Go to this web site:

http://www.tvmadeez.com/

These people (Bowtie Overdrive) have a lot of experience in 700R4 and TH250 swaps and they make several kits that address everything from the wiring to the TV cable. They’re very nice to talk with and patient beyond belief with what must seem to be easy or “dumb” questions.

Have Fun,
Glenn

Thanks for the info on the pin location cook67. I figure as long as I have the lockup feature I might as well use it.

I know a lot of guys just use a toggle switch to engage it but then you have to remember to disengage it when you come up to a stop sign. I'm going be using the circuit below that I have used in the past that allows it to be engaged with a monentary push button switch and will automatically disengage when the brake (or clutch if so equipted).

I've built these before and all you need is a constant duty relay ( I normally use a chrysler fuel pump relay), a diode rate for at least 3-5 amps) and a combination brake light/cruise switch on the peddle. The switch on the peddle is a combination switch that has 2 plugs on it the one that is normally open when the peddle is up and on that is normally closed when the peddel is up (this is the side that disengages the circuit when the brake peddle is pushed).

Originally Posted by Mike P

Thanks for the info on the pin location cook67. I figure as long as I have the lockup feature I might as well use it.

I know a lot of guys just use a toggle switch to engage it but then you have to remember to disengage it when you come up to a stop sign. I'm going be using the circuit below that I have used in the past that allows it to be engaged with a monentary push button switch and will automatically disengage when the brake (or clutch if so equipted).

I've built these before and all you need is a constant duty relay ( I normally use a chrysler fuel pump relay), a diode rate for at least 3-5 amps) and a combination brake light/cruise switch on the peddle. The switch on the peddle is a combination switch that has 2 plugs on it the one that is normally open when the peddle is up and on that is normally closed when the peddel is up (this is the side that disengages the circuit when the brake peddle is pushed).

That is the way to do it.

hhm. wonder if my 77 Olds Toronado has lockup on the TH450. There was one wire coming out and never could figure out what it was for. Guessing it wasn't for reverse backup light- think I tested for that.