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glen40

Member
The ignition switch on my 93 Discovery 200 TDI is damaged, the barrel is worn and does not seem to return from position three, the start position, and one of the lugs holding the wiring loom on the end is broken and the connections come loose.
I want to fit a push start button with still using the key to turn the ignition.
I have a push button kit that includes a solenoid and I assume I can simply cut the starter feed from the Ignition switch to the existing solenoid and rewire a feed via my push button switch.
Of the 4 cables going to the ignition barrel which do I disconnect, it would help if someone could explain the wires
Large Brown – Live Feed
Large White ??
Large White and Red ?
Small White and Red ?
Do I simply cut the existing feed from the Ignition switch to the existing solenoid thus stopping this method of starting.
Connect my new solenoid to the existing solenoid via the cable previously cut.
Connect power to my new solenoid and earth my switch to provide the circuit.
If this is the way to do it is there an issue that then I have 2 solenoids in series and secondly which is the cable that takes the power from the ignition switch to the solenoid.
OR have I got this all wrong
 
just take relay feed from switch and connect to your push button with feed from ignition side (white wire)
 
Thanks for that but dont quite understand.
Realised now however that I got the colours wrong and its a large 'White and Brown' wire and small 'White and Red' as well as the Brown and White wires.
Am i right in assuming
Large Brown - Live Feed
Large White - Fuel shut off and glow plugs
White /Brown - Warning Lights
White /Red - feed to Starter Relay

Basically if I cut the White/Red am I right in assuming there will not be a feed to the starter relay through the ignition swith so it will not work but all ancillaries will still work.
If I then connect my new starter relay to a live and to the existing relay and use the switch to close the citrcuit through an earth this should give me my push start operation.
I will then have two relays, any problems with this or should I not use the new one and simply connect my swith via the white / red to the existing relay and find a new live to the switch?

If this sets any alarm bells ringing and I am wrong please get back to me
 
OR just buy a replacement ignition lessons on how to hot wire a car aren't sensible subjects for a public forum. how are you going to get round the immboliser??
 
jamesmartin said:
why do you need two relays connect re/white to switch and use live feed to other white as ignition live
Click to expand...
Cos I got two relays, one in the kit and the existing one. Just wondered if it was of any benefit to have two or would they simply not work.
I will not use the kit one.

As to wiring in my push button will cut the red/white so then I assume there is no feed to the relay. I will connect the cut red /white to my push button. To complete the circuit do i simply splice into the Brown to get a live to the other connector on the push button?
 
jamesmartin said:
why do you need two relays connect re/white to switch and use live feed to other white as ignition live
Click to expand...

jamesmartin

Doh!! On reading your post again just realised that should get power from White as I assume that will only make it live when ignition is on as opposed to connecting to the brown which is always live and someone pushing thy button even when key is not in, or ignition is not on will result in starter turning engine over.
 
ok to simplify.

i have a 92 v8, but the wiring is the same.

the thinner white/red is the starter feed. im pretty sure the fat white is the position 2 feed.

you do not need another relay, just a switch that is capable of about 10 amps at 12v. i bought the red push switch 63230 from here

VWP - pushbutton and pull switches

simply cut the this white/red and connect the loom side to one side of the switch. leave the igntiion switch side alone, cut it back or insulate it though.

then splice into your position 2 feed (do not cut the wire, just solder onto it) and connect a new feed from the fat white to the other side of the new push button.

job done, car only starts with the ignition on.

as it happens, i fitted mine for another reason. my key switch is fine and i use it normally, but i find it very handy to have a push switch to restart after stalling off road - saves messing about with the key, and also turning off my ignition to restart also unlocks my diffs, so its best to have a separate switch which you can quickly hit anytime to restart.

also fits nicely just here :)

1a184275.jpg


cheers
 
I already have a switch installed but need to correct the work done as it burnt out my starter motor:) firstly I have been told by the garage who will correct it to get a 40amp relay and secondly to get a 35amp button start! Is that correct? And if so where can I het it from?
 
saints_76 said:
I already have a switch installed but need to correct the work done as it burnt out my starter motor:) firstly I have been told by the garage who will correct it to get a 40amp relay and secondly to get a 35amp button start! Is that correct? And if so where can I het it from?
Click to expand...


NO!! it isn't starter will draw far more than 40amp and the switch shouldn't be carrying any load at all as it will simply be activating the relay. which will draw less almost no current.

Find an Auto electrician who knows what he's doing..
 
I am slightly confused by the conflicting advice. I think I need to go On a course for my Disco:)
Seriously though I think I may just call an auto electrician. Thanks
 
You don`t need any extra Relays, the feed at the ignition switch to the starter is low current that feeds another relay (thats why its a thin wire and not as heavy as the others) If you were wiring direct to the starter then a relay would be required or one hell of a switch to handle the current!!
 
SASBOB u just hit the nail on the head. It is direct to the starter motor and that's why I need a relay then. So why has the mechanic asked me to also get a 35 amp button start? I thought a 10amp one should do the trick.
 
If you are wiring through a relay a 1amp push button will do it!! A 30amp relay only needs 500mamp ( 1/2 an amp) to switch it
 
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