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4 wire ignition switch diagram12/31/2023 The reason why Lucas and EMGO brands are producing a 4-prong switch is for "universal" applications “on and off” as fitted to most models from approx 1966 and on To answer your question in a straightforward manner the answer is the new 4-prong 30608 switch will work and replace all 3-prong ignition switchesīoth units (3 and 4-prong) feature a 2 position setting. "Which spade do I hook my wires up to?"."Do I need to send this switch back for a 3-prong switch?"."What does the 4th prong do that my original Lucas switch did not have?"."I purchased a new Lucas 30608 switch and noticed it has 4 prongs and not 3 like my original, will it make a difference?".The main question that we get from customers when replacing an old Lucas ignition switch with a new Lucas or EMGO switch is: I'm sure there are more part numbers out there, above is just a small few (you get the idea) Spades / terminals Since the Lucas 30608 switch is common on most models the "new" Lucas and EMGO switches will replace some of the following original parts numbers. The main feature most noticeable when installing a new Lucas or EMGO switch is that there are 4 spade / prong's rather than 3 spades like the original Lucas switches as shown above in the far left.įor the most part, all new Lucas and EMGO ignition switches will replace Lucas 30608 and also other associated old and new superseded part numbers. Keep reading the post below and follow along!īefore we dive into this topic, lets showcase 3 Lucas 30608 ignition switches commonly found on most late model Triumph, BSA and Norton marks along with vintage British vehicles from approx 1966 and later.Ībove we have 3 types of Lucas 30608 ignition switchesĪs you can see all the switches look fairly the same minus the style of key head, finish, etc In today's Tech Tip post we will cover the main differences from original and new switches on the market If you are in need of a replacement ignition switch or you already have a replacement switch on hand from us you may find that your spades have a different terminal count and may confuse you If you wait long enough to replace a known bad or failing ignition switch, you may find yourself stranded on the side of the road!Īlthough most know the basic function of the Lucas 30608 ignition switch, some folks are not aware that the new Lucas and EMGO 30608 ignition switches are slightly different from original Lucas switches Usually a failed ignition switch is caused by vibration, moisture and from "installing / removing" your ignition keys "in and out" over the years which will eventually wear your tumblers At some point during your ownership of a vintage motorcycle you may encounter that your original Lucas ignition switch may need to be replaced
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