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Diesel Power

Member Since: 04 Mar 2025
Location: Midlands
Posts: 19

1992 Defender 110 300 Tdi CSW Java Black

200TDI 110 wiring loom. What’s this relay for?

Hi guys

I’m tidying up my wiring loom as I’ve taken out the dash to tidy it up. The loom is in good nick considering it’s 1992. I wanted to take off any post factory bits that have been added and no longer needed. This yellow relay on the right of the steering column doesn’t look factory. Does anyone know what it does? Reading threads I think it might be for heated rear window which I don’t have nor do I have a rear wiper and don’t plan to.

Click image to enlarge

14th Oct 2025 2:58pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6722

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Factory wiring never used blue crimps like that.

Therefore not original factory, it could be someone has replaced the HRW relay but heated rear window wiring colours don't match what's there, but who knows what is going on out of shot.

Where do the wires come from/go to?

1988 90 Td5 NAS soft top

2015 D90 XS SW

14th Oct 2025 3:49pm

I Like Old Skool

Member Since: 23 Feb 2015
Location: Manchester
Posts: 880

1994 Defender 110 300 Tdi ST Coniston Green

Totally none original wiring. Does the fuse you are holding feed to the relay? If it does, try pulling the fuse and then see what stops working.

14th Oct 2025 5:45pm

Diesel Power

Member Since: 04 Mar 2025
Location: Midlands
Posts: 19

Martin wrote:
Factory wiring never used blue crimps like that.

Therefore not original factory, it could be someone has replaced the HRW relay but heated rear window wiring colours don't match what's there, but who knows what is going on out of shot.

Where do the wires come from/go to?

Thanks Martin

Had a brief look and one wire goes up to the instrument panel, another into the ignition barrel and one into the engine bay. Need to investigate further.

14th Oct 2025 6:59pm

Diesel Power

Member Since: 04 Mar 2025
Location: Midlands
Posts: 19

I Like Old Skool wrote:
Totally none original wiring. Does the fuse you are holding feed to the relay? If it does, try pulling the fuse and then see what stops working.

That’s a good idea. I’ll try that. Possibly if it’s rear windscreen though I won’t be able to tell as I have neither a rear wiper nor a heated screen 😄

14th Oct 2025 7:00pm

Mr.Jimbo

Member Since: 20 Jun 2024
Location: Rugby UK
Posts: 35

Diesel Power wrote:
Martin wrote:
Factory wiring never used blue crimps like that.

Therefore not original factory, it could be someone has replaced the HRW relay but heated rear window wiring colours don't match what's there, but who knows what is going on out of shot.

Where do the wires come from/go to?

Thanks Martin

Had a brief look and one wire goes up to the instrument panel, another into the ignition barrel and one into the engine bay. Need to investigate further.

Long shot but could be additional lights, have seen people take the feed from the main beam tell tale bulb before to switch on additional spots etc through a relay. 2003 TD5 110 CSW
Instagram: e12_hue

15th Oct 2025 11:42am

Diesel Power

Member Since: 04 Mar 2025
Location: Midlands
Posts: 19

Can’t seem to work out what it’s for but as it’s not factory I might just take it out to tidy up the wiring before the dash goes back on. If I notice something isn’t working then I’ve found the issue!

15th Oct 2025 8:03pm

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