[DoctorDex]

I'll have to look this up, but I believe the 3 ECU "chassis ground" pins connect to different grounding points in the car??

Edit: Looked this up and here's what I found:
Pins 26 & 71 - Both ground the ECU to ground point #2, which corresponds to the point beside the wiper motor on the firewall.
Pin 13 - Is the ground for the CAS. However, I can't tell from the manual where on the car it is grounded to.

I think I'll wire up all my accessories to wires coming off of Pins 26 or 71.