Installing a new wiring harness in my 100. The connections to the coil are marked as SW and CB on the BN2 wiring diagram but the newer coil in the car is marked as "+" and "-". So which is SW and which is CB? The CB terminal continues to the Distributor. SW to the ignition switch and the fuse box. The car has been converted to negative ground. I'm sure the answer is simple but this one plumb evades me.