Outer Limits 4x4 Board

I recently replaced my 1L donk with a 1.3L and replaced dash and complete wiring loom also. I just finished plugging the wiring loom in and am having some troubles starting her up.

I'm getting power to the starter and all electrics (lights, wipers, indicators, clock etc) are working fine, but I'm not getting any spark. Can someone give me a few tips as to how the coil and dizzy are wired up? What sort of voltage should I be seeing at the positive terminal on the coil? I'm only seeing 0.5V.

Also, how should the dizzy be wired - I've got a black wire coming out of it going to the negative on the coil and a yellow wire coming out of it going to the positive on the coil - is this right? Then a wire coming from the wiring loom to the positive on the coil.

Any help would be great, it's driving me crazy.

I managed to get it started today by disconnecting the loom from the positive terminal on the coil and running a wire direct from positive on the battery. The loom seems to be earthing that connection somewhere and bringing volts down to 0.5v.

Any idea where this might be happening?