Please help me understand ignition wiring & Tacho....
Posted: Mon Sep 16, 2013 11:01 pm
I'm doing a RVI --> RVC tacho conversion using the Spiyda board, my car has electronic ignition & the Tacho jumps all over the place!. Spiyda document the changes to the internal wiring of the tacho well, but do not mention changes required to the Ignition wiring itself.
I've read the tech article http://www.lotuselan.net/publish/bouncing_tach.shtml but want to make sure that I am on the right track.
As built with the RVI set up, it looks like the ignition switch supplies power through the Tacho to the positive terminal of the coil:
So If I detach either white wire from the back of the tacho the car will not run, but if I connect them together the car runs fine.
Now looking at the RVC diagram:
It looks the positive coil terminal is fed directly from the ignition switch (i.e. just connect the 2 white wires that used to go to the tacho together ) & run a new wire from the -ve coil terminal straight to the remaining single tacho input.
Am I on the right track here? I fully admit to being retarded when it comes to electronics
I've read the tech article http://www.lotuselan.net/publish/bouncing_tach.shtml but want to make sure that I am on the right track.
As built with the RVI set up, it looks like the ignition switch supplies power through the Tacho to the positive terminal of the coil:
So If I detach either white wire from the back of the tacho the car will not run, but if I connect them together the car runs fine.
Now looking at the RVC diagram:
It looks the positive coil terminal is fed directly from the ignition switch (i.e. just connect the 2 white wires that used to go to the tacho together ) & run a new wire from the -ve coil terminal straight to the remaining single tacho input.
Am I on the right track here? I fully admit to being retarded when it comes to electronics