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DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

2008 Defender 110 Puma 2.4 USW Santorini Black

Modifying heated seat wiring?

Hi All

So after a couple of mishaps in the flooding whilst out on response work, I flattened my battery and didn't get chance to really top it up properly. I was using the heated screens and seats all the time to keep things warm and demisted for the best part of 48hrs in a row.

Does anyone think it would be possible to disconnect the front heated screen and heated seats from the vehicle battery and onto a second battery. Would it be as simple as pulling the load feed from the relay housing and rerouting it?

cheers North Cumbria Search and Rescue - Team Leader

31st Dec 2015 7:49pm

pj2106

Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500

2008 Defender 110 Puma 2.4 USW Stornoway Grey

Just install a split charge system otherwise how do you charge the secondary battery?? 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold

31st Dec 2015 9:12pm

DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

Thats the plan lol. Got all the auxiliary systems going to be run off the second battery, but want to take the heated seats off the primary battery and onto the secondary so that if I'm parked up and not doing much I can't kill the main battery. I could install a new loom from FCX but I don't want that cost. North Cumbria Search and Rescue - Team Leader

31st Dec 2015 9:17pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20367

The FCX kit is well worth the cost, easy fit too.

31st Dec 2015 9:38pm

Hairysteve

Member Since: 15 Jun 2015
Location: Surrey
Posts: 692

2009 Defender 110 Puma 2.4 XS CSW Barolo Black

Hi there,

Have a look at the wiring diagram in this thread and it appears to be an easy project.

http://www.defender2.net/forum/topic8759-45.html

Cheers

Steve

31st Dec 2015 9:42pm

DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

Interesting. Cheers steve. Just wondering if anyone thinks they have some form of timer circuit? Mine seem to go off after a short while and then won't turn back on for a longer period. Don't know if thats a 2.4TDCi thing? North Cumbria Search and Rescue - Team Leader

31st Dec 2015 9:45pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Are you leaving the vehicle parked up with the engine running or not? If not running, ignition on or off?

The heated screen does not operate with the engine off. Heated seats do not work with ignition off.

Depending on how you normally leave the vehicle, you may only need to rewire the seats.

1988 90 Td5 NAS soft top

2015 D90 XS SW

31st Dec 2015 9:46pm

pj2106

Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500

If your on a split charge it doesn't really matter where they are connected too

You will only have to link batteries if main gets low 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold

31st Dec 2015 9:46pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

Duncans wrote:
they have some form of timer circuit?

No timer on them, no. What you are experiencing is the thermal switch.

1988 90 Td5 NAS soft top

2015 D90 XS SW

31st Dec 2015 9:48pm

DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

Martin, Thanks for the heads up on the heated screen. Don't need to worry about that one then (assuming front and rear are the same as its an XS) and possibly just the seats.

cheers

EDIT: Thermal switch, that'll be the offending item. So the next question is where is the switching done from the switch itself to the main seat? Would it perhaps be easiest to put some new connectors on the seats and use the feed to wire into a relay and then pull a new hard line in to run the load of the seats? North Cumbria Search and Rescue - Team Leader

31st Dec 2015 9:50pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

Ah the rear screen is active with the ignition on, so even with engine off.

Definitely no timer on the heated seats, you can see yourself from the wiring diagrams.

1988 90 Td5 NAS soft top

2015 D90 XS SW

31st Dec 2015 9:54pm

DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

Happy days. Just to clarify, is that diagram (supposedly from a TD5?) the same as a TDCi? Now just need to work out what connectors they are. Bah. Got to get the wing connectors as well at some point. North Cumbria Search and Rescue - Team Leader

31st Dec 2015 9:57pm

Hairysteve

Member Since: 15 Jun 2015
Location: Surrey
Posts: 692

PM me your email address and will send you the electrical diagrames

31st Dec 2015 10:06pm

Hairysteve

Member Since: 15 Jun 2015
Location: Surrey
Posts: 692

Click image to enlarge

31st Dec 2015 10:09pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

I might have missed something obvious here, but why don't you just leave the engine running when you've got the ignition on?
Simple way to not flatten the battery is to only use electrical things when then engine is running, the heating works much better that way too

1st Jan 2016 8:54am

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