nickm
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| posted on 28/2/12 at 08:44 PM |
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Relays
Some help please
Having my first electrical problem it is all to do with relays and ignition i have my own idea but it will confuse things so facts only
Have a premier wiring systems rear engined lucas loom, have been advised to fit a relay into the ignition/start cicuit and havent got a clue.
The ignition spur wies are brown - main supply white - coil positive or ignition pack and white/red - starter solenoid
The relay has 85-86 connected by solid line, dotted line going to half way between 30 (on its own) and an 87 and 87a switch at the other end.
Which wire goes to which please ?
Thanks
Nick M
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big-vee-twin
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| posted on 28/2/12 at 09:22 PM |
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85 and 86 is the coil.
30 is the relay contact -common
87 is normally open
87a is normally closed
My premier loom hasn't got a relay in the ignition start circuit.
Starter solenoid is connected to ignition key - starter position, and the coil pack is from a switched live via a fuse.
You can't do both from a single relay.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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Dusty
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| posted on 28/2/12 at 10:40 PM |
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Firstly you have a relay of the type intended for changing between main and dip headlights, using a single pull type column switch. It is not suitable
for the what you want to do.
Relays are electrically operated switches. They have a switching side which only needs a small current to work. Commonly worked by pins 85 and 86. The
switching current can come from something light and pretty like a savage switch on the dash, close to hand and yet operate something hefty in
electrical terms like the starter solenoid. The other terminals on a simple relay are the ones that are switched. Commonly numbered 30 and 87 there is
a physical lump of metal in the ralay which is magnetically pulled into position to bridge between 30 and 87 electrically connecting them when 85/86
are energised. So you can put a 40amp wire from the battery on 30 and another 40 amp wire on 87 and the relay does the heavy switching on/off for some
hefty electrical unit in the car all controlled by you pressing your dinky savage switch on the dash. Your savage switch will not cope with 40
amps!
The relay above is very simple. They come in a huge variety of functions and different formats.
The illustration on the side or top of the relay is it's basic circuit. You do not seem to understand these very basic symbols. Without being
offensive I think you have to learn more about circuits and wiring before you try to add a relay or your car will end up a pile of ash.
[Edited on 28/2/12 by Dusty]
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snowy2
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| posted on 29/2/12 at 11:21 AM |
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A five pin relay will switch between dip / main only if the switch is a latching type as the relay will return to 87a once the power is taken off 85 +
86.
sometimes you are the pigeon, most of the time the statue.
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snowy2
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| posted on 29/2/12 at 12:12 PM |
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http://www.godspeed.me/forums/viewtopic.php?f=14&t=1289#p2617948
That is a link to an article i wrote about fitting relays.....might help you. Dave.
sometimes you are the pigeon, most of the time the statue.
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big-vee-twin
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| posted on 29/2/12 at 12:54 PM |
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He's doing ignition not lighting
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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nickm
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| posted on 29/2/12 at 08:05 PM |
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Thanks for the replies
I may have the wrong relay !
I dont want to fit a relay at all it is what i have been advised by Sylva and an auto electrician. Premier doesnt build relays into his loom so
assuming it is not nescecary (thick cables) but i have the emarald ecu in the circuit which complicates things.
To explain back to front i have the brown cable as the main feed for batt/starter etc, the white is wired to a terminal which powers the injectors and
coil and the white red is connected to the solenoid on starter its the cockpit end i cant get my head around.
Checking the emerald simple circuit diagram and may be barking up the wrong tree as it shows a relay linked between ignition switch and fuel pump
which i can understand.
Thanks
Nick M
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