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Lancelot62

Member Since: 03 Dec 2023
Location: Dorset
Posts: 2

Defender TD5 Headlight issue

Hi All,
I have a Defender 110 TD5 Station Wagon, 2004. Headlights failed a few weeks ago, although I still had sidelights and flash mainbeam. Got home by holding the flash on and found that the light relay (the pink one) was making a high pitched buzzing noise. Took it out to check the part no and ordered a new one on line.
I replaced the old one whilst I was waiting for the new one to be delivered and, hey presto, my lights worked again. I put the new one to one side in case it happened again and yesterday it did. So I fitted the new relay and that also makes a high pitched buzzing and still no lights. Swapped back to the old one, still buzzing and no lights and then, an hour later, for no apparent reason, everything was working again!
Anyone got any idea what may be the cause?

Thanks

3rd Dec 2023 3:01pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

A relay will buzz when it is not getting enough current to properly engage it. It is likely that your main light switch is faulty, not the relay. It is a very common failure on Defenders.

EDIT: Master light switch AMR6104

https://www.lrworkshop.com/parts/AMR6104

3rd Dec 2023 3:05pm

Lancelot62

Member Since: 03 Dec 2023
Location: Dorset
Posts: 2

Thanks Geobloke.
Really helpful.

3rd Dec 2023 3:46pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

No problem

It is an easy DIY fix if a little fiddly when getting the steering column shrouds off.

3rd Dec 2023 3:51pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Just so you know:

One of the reasons the master light switch fails is because there is too much current being drawn through it and the contacts melt the plastic surround they are fitted into. This is what I mean by a known weak point.

The solution, since you are changing the switch you can protect it into the future by also fitting a stand-alone headlight loom. In this way the light switch is only switching the loom circuit and there is no load on the light switch side.

Nakatenenga do one and Boomslang and Red Bison. Plus a host of cheaper versions.

The other benefit is that if you have the standard H4 halogen headlights fitted to your Defender (the original factory ones) you will find the light output can be vastly improved with the sand-alone loom.

A two for one

3rd Dec 2023 4:54pm

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