Jaguar Ignition Switch
Discussion
I'm putting this here, rather than the Jaguar forum, as it's probably more of a classic car problem.
I have a Lucas ignition switch, with 39174B marked on the side. I can only find one reference to this on the net, but it appears to be an S1 E-type switch. Holden sell one that looks very similar, with part no 34679.
In my application, I have this switch, and a starter button. All was fine yesterday, but now, it's dead. I have no headlights (which should work with the ignition off), and my immobiliser tell-tale light is also dead. So somehow, I've lost my live feed.
What I need, and cannot find, is a wiring digram. I can find various pictures notating which wire colours go where, but the wiring colours are of no use to me; I need to know what each terminal does.
It's not in a Jaguar, BTW
Can anyone help?
I have a Lucas ignition switch, with 39174B marked on the side. I can only find one reference to this on the net, but it appears to be an S1 E-type switch. Holden sell one that looks very similar, with part no 34679.
In my application, I have this switch, and a starter button. All was fine yesterday, but now, it's dead. I have no headlights (which should work with the ignition off), and my immobiliser tell-tale light is also dead. So somehow, I've lost my live feed.
What I need, and cannot find, is a wiring digram. I can find various pictures notating which wire colours go where, but the wiring colours are of no use to me; I need to know what each terminal does.
It's not in a Jaguar, BTW
Can anyone help?
XJ13 said:
The first question is, "what have you changed/added/worked-on recently?"
The second is (and please forgive me if this sounds a bit obvious and something you will have automatically checked anyway) have you checked your fuses?
I've not checked fuses, and here's why:The second is (and please forgive me if this sounds a bit obvious and something you will have automatically checked anyway) have you checked your fuses?
When I went into the garage this morning, the switches were as I'd left them (wired up, but hanging loose, except for the starter button, which I'd disconnected entirely) The only change was a black wire, aroud 4 inches long, which was lying on the carpet. I don't know where it came from, but as I've lost live, I kind of assumed it went between the ignition switch and somewhere else. Because that wire has dropped off somewhere, I assumed that was rhe cause of my problem, and I though it wiser to ask a bunch of strangers for help rather tha do the basic checks for myself
My theory is to not touch anything else in haste, so I can't make it worse...
Doofus said:
...the switches were as I'd left them (wired up, but hanging loose, except for the starter button, which I'd disconnected entirely) The only change was a black wire, aroud 4 inches long, which was lying on the carpet. I don't know where it came from, but as I've lost live, I kind of assumed it went between the ignition switch and somewhere else. Because that wire has dropped off somewhere, I assumed that was rhe cause of my problem, and I though it wiser to ask a bunch of strangers for help rather tha do the basic checks for myself
...Doofus said:
The only change was a black wire, aroud 4 inches long, which was lying on the carpet.
Black is traditionally (but not guaranteed to be) the colour of earth wires and if you don't have earth, you don't have a circuit.Time to crack out the multimeter really and start testing continuity from battery +ve terminal out.
- Never overlook the obvious so are the +ve and -ve battery cables connected?
- Switch to Volts on your meter and test across the battery - do you have 12v or had you left a light on by accident and just drained the battery?
- If all OK so far do you get continuity from the +ve terminal to wherever you can see it's wires go/expect them to go (e.g. fusebox)?
- Keep following till you find the 'gap'.
XJ13 said:
Hi Doofus. Please don't get me wrong but I suggest asking "a bunch of strangers for help" may not be the best way of going about things in this case. If you aren't confident of carrying out the basic checks yourself (such as checking fuses / loose connections etc) you may want to get in touch with a local auto-electrician?
I didn't say I wasn't confident. I just wanted to know of anyone has a schematic of the igniton switch.//j17 said:
Black is traditionally (but not guaranteed to be) the colour of earth wires and if you don't have earth, you don't have a circuit.
Time to crack out the multimeter really and start testing continuity from battery +ve terminal out.
- Never overlook the obvious so are the +ve and -ve battery cables connected?
- Switch to Volts on your meter and test across the battery - do you have 12v or had you left a light on by accident and just drained the battery?
- If all OK so far do you get continuity from the +ve terminal to wherever you can see it's wires go/expect them to go (e.g. fusebox)?
- Keep following till you find the 'gap'.
This is what I'm part way through doing. No joy so far. Time to crack out the multimeter really and start testing continuity from battery +ve terminal out.
- Never overlook the obvious so are the +ve and -ve battery cables connected?
- Switch to Volts on your meter and test across the battery - do you have 12v or had you left a light on by accident and just drained the battery?
- If all OK so far do you get continuity from the +ve terminal to wherever you can see it's wires go/expect them to go (e.g. fusebox)?
- Keep following till you find the 'gap'.
There is a copy of the Series 1 E Type wiring diagram here:-
http://www.xkedata.com/pdf/42wiring.pdf
Although you've said your switch isn't in an E Type, this may help show you how the ignition switch and starter button should be connected.
Good luck
http://www.xkedata.com/pdf/42wiring.pdf
Although you've said your switch isn't in an E Type, this may help show you how the ignition switch and starter button should be connected.
Good luck
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