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Head & Side light problem on 1998 Defender


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I have had an intermittent problem with side and head lights on my defender. I have replaced both the main switch and the pink dim/dip relay behind the dash.

This worked for about two days, then lost both side and head lights again - not worked since.

I tested a few things with a multi meter this morning and it appears I have no power to either the main switch or the dim/dip relay.

Can any one help?

Thanks

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If you have no power to the lighting switch, the brown wire into the switch, then check the fuse box either on the left side of the bulkhead under the bonnet, or themain fuse box elsewhere, under the drivers seat, You will not be able to buy one of those fuses in Halfords

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Thanks for the replies. I will check out both suggestions however: my main fuse box is below the centre console, in front of the gear stick and I have power to the fuses which I have checked. I also have power to the headlight relay underneath the fuses and the relay is working.

As far as I was aware the dim dip is done by the pink relay behind the dash to the right of the steering column on mine? I have a late 300Tdi SW which is different to what you have described.

Thanks

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Thanks for all the advice, but I have found the problem. Someone had bypassed the main fuse under the bonnet with a small piece of wire under the fuse carrier that had melted/broken. I have now rewired and put the fuse back the way it should be. My problem is now solved, but I am curious as to why someone wanted to by pass the fuse in the first place. I will keep a watch for the fuse blowing.

Thanks for all the help.

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  • 1 month later...

As I suspected - after nearly two months of running without a problem with lights the main fuse under the bonnet, which was the problem I found has now blown.

When I tried to replace the fuse, the replacement fuse blew within seconds. I tried a piece of wire across the terminal and the wire melted and I had some thing burning behind the dash.

The current between the fuse terminals seems very high and live without the ignition on.

I have been driving in some really rough wet weather over the last few days. My horn came on and stayed on yesterday after some deep water. I disconnected it and dried it out and is fine again now.

Do you think my light fuse problem is water related? or any other suggestions please.

Thanks

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The basic function of a fuse is to protect the wiring. If you have burning smells from behind the dash that is where your problem lies and where you should look for the fault. Be handy if there were 2 of you, one to look for the problem whilst the other by-passes the failed fuse

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You were right.

I found the problem and it was a chaffing wire and nothing to do with water.

I had to take the lower dash out to re- wire the damaged circuit. It was an education, because my wiring is far from standard - lots of add-ons and work around's.

Got it sorted in the end - everything working as it should now.

Thanks for all the help.

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