E30 TPSSS MEGASQUIRT PNP HELPPPP - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-26-2013, 04:50 PM   #1
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Can somone please help me figure out what wire goes to what? I am splicing into the stock harness.... and need to figure out what is ground, what is ref, and what is signal..... Thanks in advance!!!! Oh and if there is no way to tell can somone explain in depth how to test each wire and how i will know? Thanks!1
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slammedkouki is offline   Reply With Quote
Old 10-26-2013, 07:13 PM   #2
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Easy to do if you have a multimeter.
Look for 2 wires that have no change in resistance when you move the throttle, they will be Vref and GND.
The 3rd wire is your signal. -> you've found the signal wire
Now measure the resistance between the signal wire and any of the 2 other wires. If the resistance goes up as you open the throttle, than you've found the Vref wire.
The 3rd wire is easy
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Old 10-26-2013, 09:11 PM   #3
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What he said ^ It's always best to verify, but I'll go out on a limb and say:

black: ground
red: vref
blue/white: signal

Either way you should report back with your findings for future reference.
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