1983 xj750 seca no spark on 2 &3

I put new coils an sparkplugs on the bike, then It lost spark from 2&3. I swap the coils. Still only gives spark to 1&4, so I know the coils are good. I put the old coils back on an same thing. An It ran fine before.

It says 12v from the harness to the coil. And .650 ohms at the harness to the cdi box. The only thing I can think of is the wire from the pickup coil or the cdi box.

Any suggestions before I buy a $150 used cdi box? Thxx