1985 defender 2.5 gas/petrol ignition switch connections - Defender Source
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  #1  
Old May 5th, 2013, 12:10 AM
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Philip
1997 Disco + 1985 110 2.5 na gas
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1985 defender 2.5 gas/petrol ignition switch connections

Just replaced the ignition switch in my defender. The old one had been bypassed by the previous owner and had a push button installed to start it. I am trying to correct the wiring. I need help with where the connectors go on the switch. The wiring diagram is no help

Thanks.
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  #2  
Old May 5th, 2013, 02:58 AM
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Robert Davis
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Manual or trial & error?

Quote:
Originally Posted by bobsadog View Post
Just replaced the ignition switch in my defender. The old one had been bypassed by the previous owner and had a push button installed to start it. I am trying to correct the wiring. I need help with where the connectors go on the switch. The wiring diagram is no help

Thanks.
Brown: Power source
White IG
White red starter

trial & error will give you the correct results or consult the manual as the spades are numbered and the diagram in the manual will give you the exact answer.
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"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
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  #3  
Old May 5th, 2013, 09:08 AM
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Philip
1997 Disco + 1985 110 2.5 na gas
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Location: Richmond, BC, CND
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Okay thanks. Problem is the wire diagram from the manual is not accurate.

Larger gauge brown is power source
Brown/orange is interior heater
White goes to a relay just beside the ignition in the dash
Larger white and the white with red are unknown but I will do more tracing.

Reluctant to go the trial and error route as I don't want to damage anything more.

Thanks for the help.
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  #4  
Old May 5th, 2013, 10:46 AM
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Trial & Error is not necessarily trial & error!

Quote:
Originally Posted by bobsadog View Post
... trial and error route as I don't want to damage anything more.
Trial & error is not a smoke test...
Get yourself a test light and invoke your logical reasoning skills.
So you connect the large brown wire to one of the spades and turn the key in various positions until the switch supplies power where it should, changing the spade the large brown wire is connected to each time the results are not satisfactory.
In other words try different positions and eventually you'll find the correct spade for brown.
Then you'll know where the other wires connect.
For example key on power to IG (white) key turned to start power to starter (white with red) as noted above in reply post #2, and so on.
If the key has an auxiliary position hook up the spades accordingly.
It is not hard and this was my definition of trial & error.
I use a relay for the heater in order to take the load off the contacts in the IG switch.
You'll be proud of yourself when it works as designed.
You can do it!
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RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
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  #5  
Old May 5th, 2013, 08:30 PM
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Philip
1997 Disco + 1985 110 2.5 na gas
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Thanks. Figured it out just like you said but without power and used an ohm meter. Once I had the main input the rest was a breeze. Thanks for talking me into it
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  #6  
Old May 5th, 2013, 09:28 PM
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Robert Davis
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Can you dig it?

Quote:
Originally Posted by bobsadog View Post
Thanks. Figured it out just like you said but without power and used an ohm meter. Once I had the main input the rest was a breeze. Thanks for talking me into it
I knew that you could!
Billy Crystal on a 1975 episode of Saturday Night Live
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RDavisinVA

Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
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