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Posted: **Mon Jul 26, 2021 6:57 pm**

Looking at some of the coils I have here....
The Lucas SA12 ....four different numbers
45058
45058M
45058K
45058L
Anyone have some information on these? Are they all the same in performance??
Thanks

Posted: **Fri Oct 15, 2021 4:44 am**

The letter at the end would refer to the production run which they did. Alphabetical order was used, which means that the one without the addition of the letter should have the oldest date on it, then K, then L and then M. With regards to the spec, they should all be the same.

Posted: **Fri Oct 15, 2021 9:10 am**

A bit of information here on SA12 and other Lucas coils

http://www.bobine.nl/jaguar/13-electric ... orts-coil/

Three different 12V connections have been applied by Lucas:

2.1.1 The early 12 Volt versions (coded 45058A to E) have screw posts and two nuts (2BA) for the 12 Volt wires coded 166043. These coils are marked SW (ignition SWitch) and CB (Contact Breaker points).

2.1.2 Later 12V Coil versions starting from suffix F (about December 1959) were supplied with one “LUCAR” single connector (54190096) and one double connector (54190108) that could be installed on the two (2BA) studs using the existing nuts (still leaving the possibility to use this coil on older cars with eyelets). This was done because many manufacturers had meanwhile switched over to the LUCAR kind of connector for their car production. These coils were still marked SW and CB.

2.1.3 Final 12V versions with suffix K to M (commencing 1968 running till 1978) had double LUCAR connectors riveted on the top, which no longer allowed the use of eyelet connectors. At the same time the marks SW and CB were replaced by + and – also because most cars had meanwhile switched from positive ground to negative ground.

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