Wiring problems with MS

[Datsun Deron]

Well Im glad to say I got MS-II up and running, took about an hour of messing with the wiring but I got it done. I wired it according to the diagram below.

 

 

After it was all wired the car would not start, the fuel pump would prime as normal however when starting the TACH signal in Megatune and on my autometer tach jumped all over the place. And by jumped all over the place I mean like 100-5000 RPM even though the engine was just turning over. We couldn't figure out the source of the problem after checking everything over so we decided to remove the wire from terminal 15 on the Relay board. Well when we did that of course we got no tach signal in Megatune any longer. So we hooked it back up and instead disconnected terminal 11 on the relay board. First turn without that wire and the car started up immediately, I also was getting clean tach readings like normal.

 

What I'm wondering is what is terminal 11 used for? Did it cause me problems because im not using spark control? The only other thing worth mentioning possibly is that I didnt use a sheilded wire for terminal 11 however I did use a sheilded wire for terminal 15. I put a day permit on the car today and drove it around trying to dial in the VE tables a bit and had no problems what so ever. Is there any reason why I should re connect this?

[Matt Cramer]

Terminal 11 is for spark control. Having it connected to the coil is going to cause a lot of problems when running fuel only. That drawing looks like an altered version of this one:

 

 

But the changes to the drawing to make it fuel-only are incomplete - it should say that you have direct coil control disabled, and the terminal 11 wire should be removed.