Okay, I know to get a lockup swich on a Powerstroke you have to play with the PCM. But what about those of us that don't have a PCM? I know the 12v Cummins have a fuse that you can tap into, does anyone know of one on the old IDIs?
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The IDIs have a PCM. It only controls the transmission. You need to tap into the TCC wire to install a lockup switch. If I had a wiring diagram for one of those I'd tell you which wire, but I don't have one.