Glowplug wiring question

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Obi_110

Active Member
Posts
69
Morning all,

My 110 started life with a V8, however it is now running a discovery 200tdi (all done by one of the POs).

I've just finished the top-end rebuild, and have fitted new glowplugs and have a new glowplug relay, however, as the glowplugs haven't been wired in before, I don't have any previous wiring to follow.

Can someone either share a wiring diagram, or tell me how these need to be wired? Helpfully the relay didn't come with a diagram...

ALSO

The PO replaced the ignition, but it doesn't have the same point of resistance my previous defenders had where you can prime the glow plugs - is there a diesel ignition vs a petrol one, could my 110 still have a petrol ignition? Can I simply wire the glowplugs into a simple push button for now?

TIA
 
Modern (ie after the SIII) 90's and Defenders deployed a glowplug relay that has a timer built in so you dont turn the key fully over and count to 10 any more ...

You give it power and the relay provides power to the glowplugs which automaticaly turns off after 15 seconds (ish).
You need to turn off and on again to get the power to the glowplugs.
 
miktdish said:
Modern (ie after the SIII) 90's and Defenders deployed a glowplug relay that has a timer built in so you dont turn the key fully over and count to 10 any more ...

You give it power and the relay provides power to the glowplugs which automaticaly turns off after 15 seconds (ish).
You need to turn off and on again to get the power to the glowplugs.
Click to expand...
I don't think Nineties and One Tens had that system, at leasst my 89 didn't, and that is a pretty late one.

On mine, you just turned the key up a bit, the light came on, and then you turned the key a bit further to start the engine.

The timer system came later on, although I don't know when.
 
Turboman said:
I don't think Nineties and One Tens had that system, at leasst my 89 didn't, and that is a pretty late one.

On mine, you just turned the key up a bit, the light came on, and then you turned the key a bit further to start the engine.

The timer system came later on, although I don't know when.
Click to expand...
Yeah, my 83 and 86 were the same, and you did have to count to 10 😀

I'm just not sure with mine, as its a bit of a mongrel with v8 and discovery going on.

miktdish said:
Modern (ie after the SIII) 90's and Defenders deployed a glowplug relay that has a timer built in so you dont turn the key fully over and count to 10 any more ...

You give it power and the relay provides power to the glowplugs which automaticaly turns off after 15 seconds (ish).
You need to turn off and on again to get the power to the glowplugs.
Click to expand...

I'll see if there's anything about the relay I have online, be handy if it is clever enough to time the output, I could possibly test on the bench once I know how to wire...
 
Does yours look like this ?
glow.jpeg
 
Obi_110 said:
Yeah, my 83 and 86 were the same, and you did have to count to 10 😀

I'm just not sure with mine, as its a bit of a mongrel with v8 and discovery going on.



I'll see if there's anything about the relay I have online, be handy if it is clever enough to time the output, I could possibly test on the bench once I know how to wire...
Click to expand...
Tdis are usually good starters anyway, you might not need the glow plugs. If you can get it to turn over and start, you could deal with them later.

I think you could probably get the ignition switch off a diesel One Ten, and fit that, and operate it like a 2.5 TD engined One Ten.
 
Turboman said:
Tdis are usually good starters anyway, you might not need the glow plugs. If you can get it to turn over and start, you could deal with them later.

I think you could probably get the ignition switch off a diesel One Ten, and fit that, and operate it like a 2.5 TD engined One Ten.
Click to expand...
Oh yeah, she spins over fine right now, just hoping to continue using through winter and not garage, so I suspect on cold mornings glow plugs will help no end
 
Obi_110 said:
Oh yeah, she spins over fine right now, just hoping to continue using through winter and not garage, so I suspect on cold mornings glow plugs will help no end
Click to expand...
My mate has had a couple of 200 Tdi Defenders. he lives in Kernow, but quite high up, about 600 feet, I should think.

I don't think he ever used the glow plugs at all.
 
Tbh any relay man enough will do the job, no need for a timer.
200 will start with no glow plugs, but life is much easier during winter if they work.
 
Ran my 200tdi for years with no glow plugs, started every time in winter just took 3 seconds instead of 1.5 seconds :D
 
Obi_110 said:
Er, pin position yes, numbers, no! Still safe to follow you reckon??

View attachment 299111
Click to expand...

Yes I think so. The large connectors are the feed to the glowplugs.
The others are a live feed and a feed to energise the timer, the timer closes the connection between the 2 big spades and will also put a voltage on the 'indicator' pin.
You will feel a click as it energises and a click when it lets go (about 10 to 15 seconds).
 
miktdish said:
Yes I think so. The large connectors are the feed to the glowplugs.
The others are a live feed and a feed to energise the timer, the timer closes the connection between the 2 big spades and will also put a voltage on the 'indicator' pin.
You will feel a click as it energises and a click when it lets go (about 10 to 15 seconds).
Click to expand...
Thanks so much, I'll jury rig something up outside the vehicle to test!
 
miktdish said:
Does yours look like this ?
View attachment 299075
Click to expand...
Sorry to dredge up an old post - Thanks for the help with this - I've managed to mock the relay in situ, but I'm struggling to get my head around how to wire in 3 & 5 - I assume they can be used to provide an indicator light that the relay is active, then is powered down.

So far, I have:

1) constant power in from battery
2) "glow plug" (AKA a lightbulb atm on my bench set up) that earths out back to neg
3) ?
4) Live from ignition
5) ?
6) Earth back to neg

Energising the relay with (4), the relay is active for about 17 seconds then clicks off, but I'm not seeing power to either 3 or 5 during that time - duff relay, or am I doing something wrong?

TIA
 
Pin 3 is an input which connects to the starter motor solenoid- the idea being that if you leave the ignition on and the relay times out, it will energise the glow plugs again when you crank the engine.

Pin 5 is for the switched output for the warning light on the dash- on older models this simply used the same indicator as the choke on a petrol. I can't remember if this provides a switched positive or a switched ground. It may be the latter, in which case you put an ignition-switched 12v to one side of the choke warning lamp, and the other side earths via the relay.
 
FlyingPete said:
Pin 3 is an input which connects to the starter motor solenoid- the idea being that if you leave the ignition on and the relay times out, it will energise the glow plugs again when you crank the engine.

Pin 5 is for the switched output for the warning light on the dash- on older models this simply used the same indicator as the choke on a petrol. I can't remember if this provides a switched positive or a switched ground. It may be the latter, in which case you put an ignition-switched 12v to one side of the choke warning lamp, and the other side earths via the relay.
Click to expand...

Ah, thanks for that, I'd not thought of it being a switched earth, I'll give that a try!
 
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