[Seat latch mithering the relays]

Stewgnu & Docc,

Thanks for the quick response!

The ground connections at the battery were poor, the main ground point at the GB was clean but loose (imo).  Based on the main ground being loose, I'm surprised I don't have more wire damage.

However, I'm trying to understand why the ground wire at the ECU burned.  How did high current flow from the ECU housing (that is mounted on electrically insolated vibration dampeners) back to the battery negative terminal?  None of the other ground wiring on the 2 multi wire ring terminals at battery negative terminal are burned, only the one wire that goes to the ECU housing is burned.  I guess that is why I think there was a dead short from the batt+ to the ECU housing at some point in time, possibly a failed jump start attempt.

I'm trying to determine if this over current damage is limited to this particular section of wire from batt neg. to ECU housing ground or more wide spread like in your photo of burned wiring at the TB.

Thanks Again,

Art

[Seat latch mithering the relays]

Hi,

I see your interesting discussion on the under seat electrical and felt compelled to ask a few questions.  

I have an 03 V11 LeMans that I'm trying get roadworthy by performing needed routine maintenance tasks... everything works & it runs just fine.  However, after spending some time around the battery... cleaning connections, I noticed one of the 14ga. ground wires (one of several crimped to a ring terminal) had some of the insulation burned off of it.  The wire is burned throughout the harness... I suspect, it is part of the circuit that grounds the ECU housing (also off of that same wire is the cam timing sensor shielding ground).  Without removing the tail section and stripping the wire harness to determine where else this one wire goes, I am hoping that someone here might have some insight about this circuit.  I think at some point a dead short occured between battery+  to  the ECU housing and possibly resulting in this ground wire getting cooked.  Although there is no evidence (burned ECU housing, etc.), I am having trouble determining how else this wire could have burned.  Thoughts? 

If one of you guys knows whether the ECU ground wire is connected to anything other than the timing sensor shield at the ECU & multi wire ring terminal at battery negative, I would greatly appreciate hearing from you.

I've been lurking on your forum for several weeks now and the information that I have found here has been a big help.  Sorry I hijacked your discussion.  

Thanks for reading,

Art