Engine/Transmission (1994 - 1998) Wiring Schematic Question

[Stroker Smoker]

Heres the story: A friend of mine is doing a Cummins repower of a 51 Chevy truck. He has a 180 HP 6BTA and is backing it with a NV4500.



What I am tying to figure out is what the three wires on what we are assuming is the tach sensor go to on a factory truck. The goal is to use the factory tach sendor, or is it an engine speed sensor for an auto, for an aftermarket tach.



I suppose I should just buy the factory service manual, but I would really appreciate some help.



Phill

 

[Stroker Smoker]

Isn't anyone going to take a bite at this?

 

[ata]

The three wires go to the P. M. C. Powertrain Control Module. So you have to have that for the Tach. to work. The Tach. works off a Frequency not a Pulse.

 

[bighammer]

Not sure what year you have there. In my 94 service manual the connections are as follows: (assuming you are talking about the engine speed sensor on the timing cover)



The wire oposite the flat on the plug gets an 8volt supply from pin 7 of the Powertrain Control Module II



The grey w/ black tracer is connected to pin 24 of the above



The black w/ light blue tracer is grounded





Hope that helps. Good luck with it.