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Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 122

1990 Defender 90 200 Tdi HT Bonatti Grey

Help with ignition piggy backing

Hi all could really do with some help.
I’m looking to install heated seats for winter and am doing some wiring at the moment.

My question is I am going to piggy back off the ignition switch as my wiring throughout my 200tdi is a bit dubious. Things like my cigar lighter are permanent lives so I thought for peace of mind I’d run my add on harness to ignition switch.

Here is a picture I found online of the setup I have:

Click image to enlarge

My question is which terminal can I piggy back off for a non permanent live so my seats would never be on when the engine is not running?

I assumed it may be one of the two bottom ones in the image. Post three (white wire) or post 4 (red and white wire).
Any help would be very much appreciated.

Regards Blue

22nd Sep 2024 12:33pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8050

2011 Defender 110 Puma 2.4 USW Stornoway Grey

you wont find one there. you can take an ignition live feed there but would need to put it through a switch/relay that only contacts when engine is running, something like the oil pressure is a good source for the switch. no oil pressure (engine off) no live. if you connect from an ign live it will be live with ign on regardless of what the engine is doing. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

22nd Sep 2024 12:37pm

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 122

See everyday is a school day!!
I’m getting a live straight from the battery and have got my fuse for live in line. This is for the relay portion of the wiring so when the switches are flicked engaging the relay to allow the power to pass through. So far I have installed the the fuses and the relay and routed all the wiring for direct to battery (even ground back to battery as I had the wire to do so and was passing conduit through anyway).

So the final piece of the puzzle is literally where to hook this wire to power switches to engage relays but as mentioned a previous wire butcher has been at it. Like I say I would have hooked it up to the back of the cigar lighter but that’s perm live.
Is it a case of adding an extra wire from something like the heater (which I know turns off when engine stops) adding in my extra fuse and jobs a goodun?

Sorry if this is really basic but I’m just growing my knowledge but want to do it with a lot more informed information 😊

22nd Sep 2024 12:50pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8050

Do you want ign live or live when engine is running. the two are different. your post asks for live when engine is running. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

23rd Sep 2024 12:13pm

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 122

Oh actually that is a good point. For best safety and so the battery doesn’t deplete what would you suggest?

23rd Sep 2024 12:56pm

excossack

Member Since: 22 Feb 2012
Location: North West
Posts: 5850

1999 Defender 110 Td5 SW Caledonian Blue

I think I took mine from the rear heated window feed. Ignition off = seats off

1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock

23rd Sep 2024 1:44pm

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