3.5l transplant from a 1989 E34

[teahead]

Did you connect both green wires to switched power?
Did you run a dedicated black wire direct from the coil to the tach?
Do not use any black wires in the Motronic engine harness to the tach.
you should fuse the fuel pump wire [green violet 15 amps] and fuse the green wires- one is switched power for turning on the ECU and the other one is switched power to the coil.

Don

Is this still the case? In this thread: http://www.e9coupe.com/forum/threads/e34-3-5-direct-drop-in.21463/page-2

It seems to infer you WOULD use the little black wire from the chassis to the 1.3 engine harness???

 

[sfdon]

A home run wire is never shared for trouble shooting.

 

[teahead]

Curious what this plug is for (circled in red, top right)??? Cut it off?

Also, any benefits for keeping the detacheable plug and the diagnostic port thing? I know it won't lock OEM sitting in the engine compartment, but I kind of like the idea of it being deteacheable. ALso the diagnostic port could be useful???

Finally, is there a wire for a "check engine" idiot light? I think that too could be useful. No?

View attachment 23442

 

[teahead]

Anyone?