gavin174
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| posted on 28/3/11 at 10:22 AM |
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live switch switching earth
Is there a way to use a 2 pole live switch to also switch earth at the same time
Basically on a BEC I want to use the momentary push start button to switch the earth to the clutch
Need to trick the ecu into thinking the clutch is in.
Can't permanantly earth it as then the second injectors won't fire.
Cheers Gavin.
http://www.essexkitcarclub.com
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MikeCapon
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| posted on 28/3/11 at 10:38 AM |
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Hayabusa? I have had this on other Suzukis before and just used a relay fired by the starter circuit.
HTH
Mike
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lsdweb
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| posted on 28/3/11 at 10:45 AM |
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A double pole momentary swithc should do the job - can't find any push button ones but a toggle like
this would be the one.
Wyn
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lsdweb
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| posted on 28/3/11 at 10:51 AM |
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This one??
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gavin174
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| posted on 28/3/11 at 10:54 AM |
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Hi Mike is a zx10.
Sorry to be thick but how do I switch an earth through the relay.
Diagram would be good.
Wyn the dash is all finish with a push button so would rather try and keep it if possible.
Cheers.
[Edited on 28/3/11 by gavin174]
http://www.essexkitcarclub.com
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lsdweb
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| posted on 28/3/11 at 11:05 AM |
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Gavin - a relay is probably your best option I would say - I can draw up something when I get home if Mike doesn't get back to you.
Wyn
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omega 24 v6
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| posted on 28/3/11 at 11:25 AM |
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relay 4 pin required
Term 86 earth and link to 30 term
term 85 to switched pos side of momentary switch
term 87 to clutch switced neg cable
or use a savage push to start switch with 2 sets of contacts. One set fotr the start and one to switch the earth
[Edited on 28/3/11 by omega 24 v6]
If it looks wrong it probably is wrong.
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gavin174
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| posted on 28/3/11 at 11:38 AM |
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Thanks for the quick replies.
Off to get a 4 pin relay now.
http://www.essexkitcarclub.com
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daviep
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| posted on 28/3/11 at 02:45 PM |
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If this is going to be connected to the ECU I would make sure to use a relay with either a diode or resistor built in to suppress the back EMF which
is created when the relay is de-energized as your ECU may not like having a couple of hundred volts poked up it's bum 
While the wiring suggested above will work the coil is technically wired backwards, doesn't matter with a standard relay but it does with a
suppressed one.
Correct wiring should be:
PIN #85 - Earth
PIN #86 - Positive from Start Switch
PIN #87 - Clutch switch wire from ECU
PIN#30 - Earth
Regards
Davie
“A truly great library contains something in it to offend everyone.”
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omega 24 v6
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| posted on 28/3/11 at 04:18 PM |
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I always get confused with 85 and 86 terms as we never tend to use relays with diodes or resistors at work. As Davie says my wiring will work but he
does have a point re the emf and the ecu.
[Edited on 28/3/11 by omega 24 v6]
If it looks wrong it probably is wrong.
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