I am wiring up my megasquirt to do fuel only and I am using the stock injector pigtails. This is off a 2003 5.3l

I need to know which is the negative and which is the positive side of the injector. All of the injectors have a pink wire, and the other wire is different for each injector. I done know how gm triggered them. Maybe the pinks are all grounded and they trigger off the positive?

any help would be great!!

 

The injectors are fired, by taking the neg side to ground. The pink should be hot, and the varied color wires are negative.

 

thanks!!

hopefully I will have it running in no time!!