ORIGINAL: BMiracleTX
So the positive lead of the battery hooks to the negative of the harness, then the positive of the harness goes into the positive of the EIS? Or the other way?
Hooked in series to the power wire of the EIS, right? Nothing get soldered to the tabs on the switches. Only the leads?
NO, NO, NO!
You NEVER connect a positive lead to a negative lead in this type of wiring. With the EI system, you would have the red wire of the battery pack connect to the red wire of the switch harness, which then connects to the red wire of the EI unit. You then have your switches wired in series so that when you open the switches, current cannot flow.
Series means that the switches are all in ONE wire...either one is OK. The red is switched or the black is switched.