engine ground wire locations?

[71177117]

I've been trying to locate the grounds in the engine bay of my 91 ls400. All I can find for the past couple days are electrical diagrams that don't really help and a thread about replacing them after 8 years. I've only found one that's right next to the fuse box but not sure where it leads since everything is wrapped up. I get off work around 6pm so it's pretty hard for me to poke around nearing darkness and after a hard day at work.

Can someone tell where the grounds are in the engine bay or point me somewhere to make my search easier? Thanks in advance for any help.

 

[gloverman]

The main EFI earths are on the back of the RH head - cheers

 

[71177117]

Thank you for the help. Very much appreciated. I'm assuming that I will have to gently rip off the black carpet that covers the firewall to reach them.

 

[Lextreme II]

I think there are two wires. One behind the right head and one behind the left head. I just took out the engine a week ago and yank one wire out but noticed there were two behind the heads.

 

[tsirovy]

There is a ground wire behind the right head, the left head, one connected to a metal plate where the a/c compressor and oil filter tube connects and on the other underside of the engine from the block to the frame.