macattack Posted June 1, 2017 Share Posted June 1, 2017 this is on a 96 mack mr688s truck. trans temp sending unit has 2 wires going to it. one is the send is the other wire for ground? dam gauge wants to jump all over the place. Quote Link to comment https://www.bigmacktrucks.com/topic/50031-trans-temp-sending-unit-wiring-mr688s-with-a-allison-740/ Share on other sites More sharing options...
Mackpro Posted June 2, 2017 Share Posted June 2, 2017 For an auto trans, one wire is grounded and the other goes to gauge. VMAC2 MR scan0497.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/50031-trans-temp-sending-unit-wiring-mr688s-with-a-allison-740/#findComment-371273 Share on other sites More sharing options...
macattack Posted June 2, 2017 Author Share Posted June 2, 2017 thanks for the info. i am thinking i will splice a long wire from the sending unit (ground wire) and route it inside the cab and when the gauge decides to act up i could touch that wire to a ground source inside the cab just to see if the gauge stops acting up. think i will leave the sending unit hooked up as original but run a jumper from the ground wire to inside the cab. thanks again Quote Link to comment https://www.bigmacktrucks.com/topic/50031-trans-temp-sending-unit-wiring-mr688s-with-a-allison-740/#findComment-371299 Share on other sites More sharing options...
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