Torque Converter lockup - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-06-2002, 10:43 AM
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Torque Converter lockup

Here are a few pics/ diagrams of my wiring harness for the 700R4 to tell it to lockup. Well, it's not locking and I'm not sure on which wires should be hot for it to lockup. Any help please
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post #2 of (permalink) Old 05-06-2002, 10:46 AM
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Re: Torque Converter lockup

Real pic of harnes
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post #3 of (permalink) Old 05-06-2002, 12:44 PM
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Re: Torque Converter lockup

Well, it's usually the vacuum switch in my experience that fails. I'd unhook your detent cable and then eliminate the vacuum switch and hook up a temporary toggle switch so you can control it.

I don't have a wiring schematic but if I had to guess by what your pictorial diagram shows that you'd need all the wires to be hot. That connector in your lower left might be for a temperature sensor to stop the torque converter from locking up when the motor is cold. I, myself, eliminated mine but I think mine worked off vacuum anyway. I'll look at it after my final exam tonight.
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post #4 of (permalink) Old 05-06-2002, 01:14 PM
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Re: Torque Converter lockup

I tested the vacuum switch and if I suck on the hose it does open. This quite working after I put the new motor in. Maybe I'll run a togle switch to test it maybe the vacuum port or something is bad. Thanks
post #5 of (permalink) Old 05-12-2002, 06:46 PM
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Re: Torque Converter lockup

I played with this all day yesterday in my new 85 Jimmy full size, and it came down to: all THREE wires have to have power to them for it to lock up
post #6 of (permalink) Old 05-13-2002, 09:04 AM
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Re: Torque Converter lockup

Thanks! I found a wiring diagram and it looks like to me (very hard to read though) and it looked like one is always on, one is for 4th gear and one is for 3rd gear but I wasn't sure on that. I'm taking my truck in this morning later to the shop because even with all 3 hot it still wouldn't lock so it has to be internal somewhere
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