The 'E' Type Forum

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

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

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.

Hello Richard, hello andrew,

For positive earth cars:

sw = "-" and
cb = "+"

Thank you
John

Desmo wrote: ↑

Wed Aug 10, 2022 10:41 am

Hello Richard, hello andrew,

For positive earth cars:

sw = "-" and
cw = "+"

Thank you
John

It should be CB, not CW.

Sorry,

you are right.

Best regards
John

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

Thank you Andrew.

John