Hi, sorry for opening old thread. I actually trying to figure out how to *wire* resistor pack - I have turboed GS 4G63 and wiring colors are a little different, so I just need to know how ECU give signal to injectors - if it connect + or - and what i need to connect to resistor - ground or plus?

My injector wires are RED (ground) and GREEN with YELLOW stripe (plus i think) … RED wired i checked with ground and between injectors and that wires are connected between and ground.

GREEN wires are independent.

So for sure i need to ask - I can connect red wires like you connected YELLOW, right ?

This is a tech article not a thread but your confusion is understandable.

First, the injectors are not polar, there isn't a + and - to them. They have two wires, one that gets +12v from the electrical system and the other goes to the ECU where it switches it to ground to fire them.

On a 1G 4G63 NA the wires are thick (1.25mm) Yellow/Black, Yellow/Red, Yellow/Green, and Yellow/White that are all connected to the output of the MPI relay to get battery voltage. The ECU side wires are thin Yellow/Blue, Yellow/Black, Light Green/Gray, and Light Green/White for cylinders 1-4 respective. Not sure which car you are working on with the colors you listed.

The important part is that is you use low impedance injectors you need injector resistors and then go between the power source and the injector. On a turbo car they have a single power feed wire that all four resistors are connected to and then the other end of the resistor runs to one of the injectors with the other wire at the injector running to the pin on the ECU.

So figure out which injector wire is common to all and which wire runs to the ECU, then put the resistors in series with each of those power wires.

Its a EU spec N/A 4G63 what is turboed already. I checked all with multimeter, red wires are connected between each other and to ground, other wires are to ECU like you said and sends the signal to each injector. That connected wires with ground make sense to connect with resistor pack, because if i connect other wires like dummy, injectors can spray in one moment so like i said i wanted to know how exactly things works and be 100% sure about wiring.

I checked impedance of new injectors, old injectors and pack itself so dont worry about my knowledge, but always when i search something, its hard to find exact info about my spec, because in US they are not. So i checked always 2g GST specs, because they are closest to mine and at least i can spec and follow it.

Check my build thread in profile if you can and see my path of rebuilding.