Nobimmer 694 Report post Posted November 26, 2009 Just about to start wiring the dash up and need to know what a few wires do. 1.Ignition, IIRC it is the thick green one with yellow stripe. 2. Fuel pump, well basicly need to know what wire I can put a switch between to turn it on and off ( it runs off a relay on the master kill switch). Also, does anyone have a wiring diagram for the ECU? I need to know what pin is the speed input for my electronic speedo. Any help would be mint Cheers Ashkan Quote Share this post Link to post Share on other sites
antil33t 90 Report post Posted November 26, 2009 http://www.e21bmw.net/tech/motronic.php That's them converting it to work in an E21. Apparently it's pin 29, Black/White. ECU doesn't seem to be in the wiring diagrams I have. Quote Share this post Link to post Share on other sites
e30ftw 410 Report post Posted November 27, 2009 Just about to start wiring the dash up and need to know what a few wires do. 1.Ignition, IIRC it is the thick green one with yellow stripe. 2. Fuel pump, well basicly need to know what wire I can put a switch between to turn it on and off ( it runs off a relay on the master kill switch). Also, does anyone have a wiring diagram for the ECU? I need to know what pin is the speed input for my electronic speedo. Any help would be mint Cheers Ashkan 1. Ignition is the Green thick wire, No yellow stripe. Just straight Green. 2. It shouldn't matter which wire you use, Either way you are going to be open / closing the circuit by adding a switch in there. Pinouts for motronic connector: http://www.deskbreaker.com/wiglaf/e30/motr...s%20harness.xls Pin 29 is the Speed. Quote Share this post Link to post Share on other sites
Nobimmer 694 Report post Posted November 27, 2009 Cheers for that. Would still be keen to find out what wire is for the fuel pump. Have read somewhere that it can still run for a few seconds from the battery. It is for a master kill. Quote Share this post Link to post Share on other sites
e30ftw 410 Report post Posted November 27, 2009 Could be the pin #3 ? So when ECU comes on, it powers up the fuel pump relay to turn on the pump.. Quote Share this post Link to post Share on other sites
rjac001 0 Report post Posted November 27, 2009 Cheers for that. Would still be keen to find out what wire is for the fuel pump. Have read somewhere that it can still run for a few seconds from the battery. It is for a master kill. I'm 99% sure fuel pump is Green with purple stripe Quote Share this post Link to post Share on other sites
Nobimmer 694 Report post Posted November 28, 2009 Sweet, cheers for the help fellas. Was going to do it all last night, but then got sidetracked by attainable vagina. Will do it on Monday. Quote Share this post Link to post Share on other sites
323e30 0 Report post Posted November 28, 2009 The thick green wires kills everything except for the lights from memory. one kill switch to do the lot. Quote Share this post Link to post Share on other sites
