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Are you saying that when you activate the OD switch on the shift lever to shift into fourth gear that you want to turn on the transmission cooler fan? I am not sure what your objective is here. If t
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You can install another push button switch in the shifter and use it to trigger the relay. I've installed one in my truck as well as @JAG1truck. Here is how to do it. https://mopar1973man.com/
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It can be done using two relays and the factory OD switch. I drew up rough schematic on the back of an envelop while having my afternoon coffee. If your interested I can draw up a more detailed sche
I’ll be finishing up installing my remote trans cooler over the weekend and I’d like to trigger the fan relay with the OD switch on the shifter. Is this possible, and if so where is the best place to tap my trigger wire? @IBMobile posted a diagram a while ago showing the circuitry, wiring, and fuses between the PCM and the shifter button (switch) that command OD on/off but I don’t understand it well enough to start cutting wires yet. His diagram shows fuse #14 powers the OD on/off light, so can I tap it there? And where is fuse #14 actually located? I’d tap into the wiring from the on/off button on the shifter, but it’s a momentary switch so I don’t think I can do that without using a special relay.