LeftySS

iTrader: (17)

Does anybody know what the wires going to the fuel/nitrous sending units are?

Black=?
Grey=?
Purple=?

Chris@NitroDaves

What are you refering to.......Window switch, progressive contorller etc???????

-Chris

LeftySS

iTrader: (17)

The three wires that come off of the sending units or should say plug into the sending units from the nitrous pressure and fuel pressure autometer guages.The purple, black, and grey wires.

Beer99C5

iTrader: (21)

black is ground
Grey is +
Purple is the voltage the sending unit puts out to the gauge or logger

The sending unit is 5v not 12 v so do not put the grey to 12v

LeftySS

iTrader: (17)

So I guess if I am getting less than 1 volt on the purple I have a bad sending unit? What I find funny is that the guage will power up without the 3 sending unit wires connected but as soon as I connect them the guage won't move, like I have a bad guage. Why would this happen? But the guage is putting out 4.87V when I test the grey and black wires.

Beer99C5

iTrader: (21)

If you are using the gauge the gauge steps down the voltage so you are ok (unless you put 12 v to the sending unit directly...)

The purple wire is the variable voltage and should go up or down (0-5v) with the presssure (fuel or bottle).

Shoot autometer an email through there tech support, if it's new they will likely replace the sending units, of it's used you can buy just the sending units from summit racing.