zetec
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| posted on 19/11/04 at 12:25 PM |
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Start button wiring.
Thinking of fitting a tarty start switch on my dash. My electronics skills are basic so go with me on this one!
I was going to use a relay as I'm not 100% sure the switch is up to the load. I wanted to stop the switch being able to work once the engine had
started. My thoughts was to use a zenor diode to supply the relay + feed via the switch, with the diode "trigger" supply coming from the
oil presure switch. The idea being that the relay would work as long as the oil presure light was on, and continue to work after the oil presure
switch dropped the supply to the trigger, but once the start button circuit was broken the diode would no longer allow current to flow again until the
oil presure switch supplied another feed to the diode trigger.
If you got all that well done!
My whole cunning plan is based on the idea that a zenor diode will only allow current to flow when its trigger connection gets a voltage applied to
it, and once current flows it will be able to do so regardless of the condition applied to the trigger until the flow stops, then the who process
needs to be repeated.
Any help comments and all that...
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Northy
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| posted on 19/11/04 at 01:01 PM |
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Why not make the oil pressure switch, switch a relay to cut the power to the start switch? Will deffo work! 
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing! 
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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Hellfire
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| posted on 19/11/04 at 01:16 PM |
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Our's is a BEC and has a SB. It's not like you can't hear the engine running and mistakenly press it again. No sir!
But if that's what you wanna do.... good luck!
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Peteff
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| posted on 19/11/04 at 01:16 PM |
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Good plan till you stall in traffic and have to wait for the oil pressure to disappear before you can restart. It can take 30+ seconds in my pinto
engine.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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splitrivet
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| posted on 19/11/04 at 01:31 PM |
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Are you thinking of a transistor zetec a zener diode is essentially a voltage regulation device.
I would think a timer device on the ignition switch would be a better bet, maplins do a kit for a few quid which would latch on for a predetermined
time (settable by your self)which would give you "x" seconds to hit the starter button.
I'll find the code for the kit and post it later.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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zetec
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| posted on 19/11/04 at 02:20 PM |
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Pete, not using that spare gearbox oil in the engine again are you!
The idea was that I could possibly still crank the engine if the oil presure light had gone out, but once I had let go of the button when the engine
was running it would make no difference if my younger passangers pressed it again.
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Peteff
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| posted on 19/11/04 at 04:36 PM |
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Of course, you have to recycle . If they have a belt on they won't be able to reach it anyway, unless they are part octopus  .
10/40 actually though.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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silex
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| posted on 19/11/04 at 05:54 PM |
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Take the feed from the alternator charging wire rather than the oil pressure switch, the reponse will be much quicker.
Murphy's 2 laws
1. If it can go wrong it will
2. In case of emergency - refer to rule 1.
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Northy
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| posted on 19/11/04 at 06:12 PM |
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quote:
Originally posted by silex
Take the feed from the alternator charging wire rather than the oil pressure switch, the reponse will be much quicker.
Now thats a good idea!
Graham
Website under construction. Help greatfully received as I don't really know what I'm doing!
"If a man says something in the woods and there are no women there, is he still wrong?"
Built 2L 8 Valve Vx Powered Avon
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splitrivet
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| posted on 19/11/04 at 06:46 PM |
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Sounds better to me. A zener diodes going to do nowt tho.
Cheers,
Bob
I used to be a Werewolf but I'm alright nowwoooooooooooooo
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Mix
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| posted on 20/11/04 at 09:41 AM |
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I think that if you intend to use the oil light supply to operate a current controlled device you should be looking to use a silicone controlled
rectifier, (also known as a thyristor), as Bob says a zener diode won't work, at least not by itself.
Mick
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silex
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| posted on 20/11/04 at 10:12 AM |
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If you are not electronically minded, then using a relay is probably your easiest way to go.
Connect the alternator charge wire to the relay coil. Connect the other side of the coil to ground. Connect your push button switch to 12 volts on one
side an the other side the unswitched pin on on the relay. This will leave you with two pins on the relay. One is normally closed, the other normally
open. you need to connect the normally closed side into the rest of your normal start circuit.
When you then press the start button the engine will start, the alternator charge then energizes the relay, cutting the start button out of the
circuit.
Sorry for no picture, but I'm at work and unable to attach one.
There are of course more sofisticated ways of doing this, but I thought you wanted it simple to follow.
Murphy's 2 laws
1. If it can go wrong it will
2. In case of emergency - refer to rule 1.
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donut
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| posted on 24/2/05 at 05:28 PM |
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Why do you need a relay? Surley there is one in the system anyway. All i di was take the relevant wires off the barrel and solder to the push
button.....worked a treat.
It was a sierra based system.
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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Danozeman
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| posted on 25/2/05 at 05:38 PM |
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A timer in the system sounds the simplest way.
Surely if your younger passengers touch the button a clip round the lug hole will make them leave it alone?..,.
Not meaning to affend with that comment..
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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Spyderman
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| posted on 25/2/05 at 06:25 PM |
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If you are using the ignition switch from the donor car then why not just put the output from the key start position through the start button. This
way the key needs to be turned and the button pressed at same time. When the key is released then the button is safe.
Terry
Spyderman
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tks
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| posted on 25/2/05 at 10:09 PM |
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anyone idea
Anyone knows how the Renault laguna has the SB system working?
i mean what if you are driving and pushed the button?????
and what if you take out the card while driving???
TKS
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clbarclay
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| posted on 26/2/05 at 12:04 AM |
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The final turn on the key on one of familys cars stoped working, only the final turn to work starter motor.
A wire was run from the + terminal of the starter motor to a push switch on the dash board and then back to the solinoid on the starter motor.
This makes a change from using a screwdriver to link + terminal and solinoid.
Works a treat but would advise using a switch with a flip open cover to prevent accidently pressing switch.
[Edited on 26/2/05 by clbarclay]
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