Ingnition coil connection points

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Desmo
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#1 Ingnition coil connection points

Post by Desmo » Tue Aug 09, 2022 7:07 pm

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

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rswaffie
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#2 Re: Ingnition coil connection points

Post by rswaffie » Tue Aug 09, 2022 7:17 pm

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

S1 3.8 FHC Opalescent Golden Sand with Tan Trim 8895**
Now enjoying my diy nut ‘n’ bolt restoration. :swerve: :wrench: :hammer: :fingerscrossed:

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abowie
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#3 Re: Ingnition coil connection points

Post by abowie » Wed Aug 10, 2022 12:04 am

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.
Andrew.
881824, 1E21538. 889457. 1961 3.4l Mk2. 1975 XJS.
http://www.projectetype.com/index.php/the-blog.html
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#4 Re: Ingnition coil connection points

Post by Desmo » Wed Aug 10, 2022 10:41 am

Hello Richard, hello andrew,

For positive earth cars:

sw = "-" and
cb = "+"

Thank you
John
Last edited by Desmo on Wed Aug 10, 2022 2:23 pm, edited 1 time in total.

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#5 Re: Ingnition coil connection points

Post by abowie » Wed Aug 10, 2022 1:18 pm

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.
Andrew.
881824, 1E21538. 889457. 1961 3.4l Mk2. 1975 XJS.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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Desmo
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#6 Re: Ingnition coil connection points

Post by Desmo » Wed Aug 10, 2022 2:22 pm

Sorry,

you are right.

Best regards
John

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#7 Re: Ingnition coil connection points

Post by abowie » Thu Aug 11, 2022 12:22 am

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
Andrew.
881824, 1E21538. 889457. 1961 3.4l Mk2. 1975 XJS.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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#8 Re: Ingnition coil connection points

Post by Desmo » Thu Aug 11, 2022 7:59 pm

Thank you Andrew.

John

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