• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!

    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

Rewiring/Coil Question

MikeAH100M

Jedi Hopeful
Silver
Country flag
Offline
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.
 
If your battery positive post is the hot one going into the cars solenoid, the the + on the coil is connected to the ignition switch. ( this would be a negative ground system, used on most modern cars )

If you battery negative post is the one going into the cars solenoind, the - on the coil is connected to the ignition switch. ( this would be a Positive ground system, as found on many early English cars ).
 
Back
Top