BratNetwork Posted February 4, 2020 Share Posted February 4, 2020 I am converting a 1999 Mack RD from a tanker to a dump truck. I am going to be installing a hot-shift PTO in this truck and would like to have it so when the truck exceeds 5 or 10mph it turns off the PTO. I don't currently have the software to program this, but I am in the process of getting it. Can anyone tell me where the wiring to tie into this is? And how it should be hooked up? I know I need to use a relay, but is the signal from the ECM + or -? The oldest wiring diagram I can find is from 2000 and I am not sure if it is the same as the this truck. Any help would be appreciated. RD ECM.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/60837-ecm-wiring-to-pto/ Share on other sites More sharing options...
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