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cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 131

1990 Defender 110 200 Tdi SW Santorini Black

Defender TDI 200 (1991) Master Light Switch

Hi,

Does anyone know where the master light switch fuse is located, as shown in the attached photo?
It's completely malfunctioning: no lights, no brake lights, no license plate light, etc.

Any relay of this switch?

Thank you.

Click image to enlarge

29th Jul 2024 3:03pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20033

The likelihood is the switch needs replacing, the contacts burnout on them after a while unless you use an aftermarket headlight loom, the other circuits you mention are associated but it’s the headlights which draw the load.

I would imagine, unless there is a short the fuse is not blown and it’s the switch itself as it is common. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

29th Jul 2024 3:34pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 131

Hi,

Ok, so does that mean this unit does not have any relay or fuse?

Thank you for the information.

30th Jul 2024 2:24am

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 99

1990 Defender 90 200 Tdi HT Bonatti Grey

There is no relay on this switch I believe. The power runs direct from battery through this switch and burns the contacts out. I bought a boomslang red bison after market to use two waterproof relays. I didn’t think much to it as was so I modified it to suit my liking 😊.

Long and short if it’s not the main fuse above the tunnel, a dodgy connection or earth then it is more than likely the stalk switch.

2nd Sep 2024 9:50pm

MarkBrown

Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 393

1983 Defender 110 Other HT Auto Keswick Green

The main fuses are above the gearbox tunnel, as said. If I remember the brake light, indicators and blower motor are on one fuse, there’s fuses for the side lights, possibly each one, then main and dip, one for each side. I had a fault with a switch, but it was the dim dip and it had burnt contacts/ melted plastic.

I also had repeated problems with the new rear lights blowing fuses due to poor contacts, but this was solved by fitting led units.

The wiring looms chaff through inside the chassis rails, causing all sorts of odd things, such as flashing brake lights and indicators coming on with the brakes.

2nd Sep 2024 9:59pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 131

Blue Blood wrote:
There is no relay on this switch I believe. The power runs direct from battery through this switch and burns the contacts out. I bought a boomslang red bison after market to use two waterproof relays. I didn’t think much to it as was so I modified it to suit my liking 😊.

Long and short if it’s not the main fuse above the tunnel, a dodgy connection or earth then it is more than likely the stalk switch.

Hi Blue Blood,

Thank you for the information! Please see the attached photo with the red circle. I opened it last month and noticed that the switch is loose and doesn't stay in place when I turn on the light.

So I found a way to temporarily keep it in place. Hahahaha...Just using it for a while before it stops working completely. hahahaha

Click image to enlarge

3rd Sep 2024 4:34am

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 131

MarkBrown wrote:
The main fuses are above the gearbox tunnel, as said. If I remember the brake light, indicators and blower motor are on one fuse, there’s fuses for the side lights, possibly each one, then main and dip, one for each side. I had a fault with a switch, but it was the dim dip and it had burnt contacts/ melted plastic.

I also had repeated problems with the new rear lights blowing fuses due to poor contacts, but this was solved by fitting led units.

The wiring looms chaff through inside the chassis rails, causing all sorts of odd things, such as flashing brake lights and indicators coming on with the brakes.

Hi MarkBrown

Ok, thank you for your information and thanks for your sharing.

love it.

3rd Sep 2024 4:35am

Blue Blood

Member Since: 14 Jun 2022
Location: Shropshire
Posts: 99

The contacts look quite clean from that photo like they have barely any wearing on them, may sound silly are they making proper contact?
It may be worth getting the old multimeter and check the switch and also the wiring itself for continuity?
Past that it’s got me stumped 🤔

cykoh85 wrote:
Blue Blood wrote:
There is no relay on this switch I believe. The power runs direct from battery through this switch and burns the contacts out. I bought a boomslang red bison after market to use two waterproof relays. I didn’t think much to it as was so I modified it to suit my liking 😊.

Long and short if it’s not the main fuse above the tunnel, a dodgy connection or earth then it is more than likely the stalk switch.

Hi Blue Blood,

Thank you for the information! Please see the attached photo with the red circle. I opened it last month and noticed that the switch is loose and doesn't stay in place when I turn on the light.

So I found a way to temporarily keep it in place. Hahahaha...Just using it for a while before it stops working completely. hahahaha

Click image to enlarge

Click image to enlarge

3rd Sep 2024 12:15pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 131

Yes Blue Blood.

The contacts look fine, and I suspect it's just loose in that area. Haha... maybe I'll double-check all the wiring and see.

5th Sep 2024 2:22pm

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