Ingnition coil connection points

[Desmo]

Hello,

For testing I would like to fit a replacement ignition coil. On the original item, the contact points are marked with "CW" and "SW". On the new one with "+" and "-". Which connection point of the old coil corresponds to that of the new one ? It is the 3.8 engine and unchanged positive ground.
Thank you for your help.

John

[rswaffie]

From memory, for positive earth cars, the wire from the ignition switch went to the "-" , which was the sw terminal on the old version.

[abowie]

CB = contact breaker
SW = switch

In a positive earth car the negative wire goes to SW and the positive to CB which earths when the points close.

[Desmo]

Hello Richard, hello andrew,

For positive earth cars:

sw = "-" and
cb = "+"

Thank you
John

[abowie]

Hello Richard, hello andrew,

For positive earth cars:

sw = "-" and
cw = "+"

Thank you
John

It should be CB, not CW.

[Desmo]

Sorry,

you are right.

Best regards
John

[abowie]

John an excellent guide to auto electrics is Rick Astley's book.

Publisher
Veloce Publishing Ltd
ISBN-13
9781845849481
Book Title
Classic British Car Electrical Systems: Your Guide to Understanding, Repairing and Improving the Electrical Components and Systems That Were Typical of British Cars from 1950 to 1980

[Desmo]

Thank you Andrew.

John