Tiger Super Six
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 posted on 17/7/11 at 10:03 PM |
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Switched and Ignition Switched Live Question
I am about to wire in my ECU (Omex) and it has a thick wire that it says should go to a switched live and a thin wire that should go to an ignition
switched live. The second one I get, but what's the difference for the switched live? Should that just go to the battery and if so, why is it
called a switched live?
Mark
Mark
Tiger Avon
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jabs
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| posted on 18/7/11 at 06:22 AM |
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As it is a thick wire then assume it will take some current so rather then go directly via ignition switch it will go via a relay switched by the
ignition
[Edited on 18/7/11 by jabs]
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John Bonnett
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| posted on 18/7/11 at 06:33 AM |
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quote:
Originally posted by Tiger Super Six
I am about to wire in my ECU (Omex) and it has a thick wire that it says should go to a switched live and a thin wire that should go to an ignition
switched live. The second one I get, but what's the difference for the switched live? Should that just go to the battery and if so, why is it
called a switched live?
Mark
I'd recommend a call to Omex for clarification. It's not something you'd want to get wrong.
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Tiger Super Six
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| posted on 18/7/11 at 10:07 AM |
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Cheers for the replies chaps.
I have phoned Omex support and they have said that the thin wire runs the ECU and draws 0.5 amp so that's fine for them to quote as going
through the ignition switch.
On the other thick wire, this is the feed for the coil pack which draws larger current so they can't state on their paperwork that it can go
through the ignition switch as some ignition switches will not take it. He asked where I was taking the ignition switch from and I said the old
ignition switch live wire that went to the + side of the pinto coil. He said as it used to run the coil it should be fine to wire up to this switched
live.
Bascially, he said the usual way to wire it up is to join the wires together and run them through an ignition switched live, but they can't put
that down due to some ignition switches not being up to the job.
Mark.
Mark
Tiger Avon
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snowy2
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| posted on 19/7/11 at 07:20 AM |
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switched live......a live that is "live " after it has been switched....i.e. by an ignition switch or relay or any other switch.
First wire would be supplied by a relay which is operated by the ignition switch , the second will be direct from the ignition switch.
Why? modern switches are not normally capable of switching large current flows so relays are required.....
sometimes you are the pigeon, most of the time the statue.
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nick205
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| posted on 19/7/11 at 08:55 AM |
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I'd wire it via a fused relay to avoid any uncertainty with the ignition switch. It should also allow you more freedom in positioning the
components for the shortest wire lengths and a good feed to the coil pack. It will also make for easier changes in the future should you want to
change any of the components involved.
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