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D.U.I. Distributor kill switch question

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Old Sep 30, 2021 | 06:44 PM
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Default D.U.I. Distributor kill switch question

it connects the negative side of the coil directly to ground. How does that not fry the coil? Is it because there is so much resistance in the coil (circuit) that current is not that high ?
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Old Oct 1, 2021 | 01:16 AM
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Weird approach to a 'kill' switch. Easier just to put a 'hidden' toggle switch in the power line going to the + side of the coil. No power to the coil....no Joy.
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Old Oct 1, 2021 | 01:23 AM
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Originally Posted by 7T1vette
Weird approach to a 'kill' switch. Easier just to put a 'hidden' toggle switch in the power line going to the + side of the coil. No power to the coil....no Joy.
Yep. I remember reading years ago about using this approach (grounding the neg lead to the coil) and chose not to do it, because it seemed like a weird way to do it. Instead, I put a hidden switch in the 12 ga wire to the starter solenoid, but now that I have a remote solenoid, it’s easy to defeat. So I bought this kill switch from D.U.I. when I bought my new distributor…..

adding a switch on the + side of the coil might add unwanted resistance to the circuit…..but that’s just a guess….

Last edited by need-for-speed; Oct 1, 2021 at 01:37 AM.
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Old Oct 1, 2021 | 06:03 PM
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Well I called Performance Distributor and the guy assured me it was no problem and that is the way it is supposed to work. There is a 20 amp inline fuse in the circuit.




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Old Oct 1, 2021 | 06:19 PM
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Default I concur!

Originally Posted by 7T1vette
Weird approach to a 'kill' switch. Easier just to put a 'hidden' toggle switch in the power line going to the + side of the coil. No power to the coil....no Joy.
kill the power to the coil.
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Old Oct 1, 2021 | 06:22 PM
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A switch should have virtually no ohms of resistance when NC (normally closed) and almost infinite resistance when open. Then using some generous wire gauge say 12-14 gauge will have virtually nil resistance as well.

Good luck!
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Old Oct 1, 2021 | 06:25 PM
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Thanks L46 man. Do you see any issue with the method shown in the instructions in post 4 ?
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