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PumaPhil

Member Since: 26 Oct 2014
Location: Bridgend
Posts: 201

2015 Defender 90 Puma 2.2 HT Aintree Green

Trailer tell-tale light

I have a 2015 90 which is often towing. When I use the indicators with no trailer attached the little trailer tell-tale light on the dash flashes once, which I believe is normal. If I turn the hazards on it flashes constantly. Which I also belive is normal? All good....

However, when a trailer is attached it behaves in exactly the same way. I tow trailers with both LED and standard lamps, both of which have no affect on the tell-tale light.

First time I took to the dealers they said it had no problem, second time they replaced the indicator relay. However nothing has changed.

Is there a solution (the rdx relay perhaps?) That will make both led and standard trailer lights flash? The lamps on the Defender are standard.

I realise it's a minor problem, but it's irritating me that it's not working!

11th Oct 2016 8:53pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17355

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The obvious question: when you're towing do the trailer indicators work?

11th Oct 2016 9:18pm

PumaPhil

Member Since: 26 Oct 2014
Location: Bridgend
Posts: 201

Forgot to mention that! Yes, the indicators on the trailers are working. The same trailers make the tell tale light on another 2015 defender flash as it should do.

11th Oct 2016 9:29pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17355

That's wierd!

Can you try swapping the flasher relay over with the other Defender?

11th Oct 2016 10:04pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20304

Are trailer lights incandescent or LED? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️

11th Oct 2016 10:43pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

I had a bit of this the other day when I was servicing a trailer for a friend, when I turned the lights on there was a bleed trough to all the lights, every bulb was lit, lights off indicators on and they also made all the other bulbs glow dimly on each flash. but the tell tale wasn't working.
After a set to on the trailer plug, a clean up and open the pins up a bit it all went away and everything worked as normal, including the tell tale on the dash.
I'd suggest that you either change the socket on your motor, as it has the same effect on which ever trailer you tow, or take it apart and give it a good clean. 90% of trailer light problems are due to the socket/plug.

12th Oct 2016 10:36am

PumaPhil

Member Since: 26 Oct 2014
Location: Bridgend
Posts: 201

Thanks all for your replies.

Blackwolf- that other Defender has been changed for a commercial Discovery!

Custom 90 - both. Of the 3 trailers used regularly 1. About 10 years old with incandescent lamps and a 7 pin plug, no signal to the tell tale at all.
2. Has brand new wiring with LED lamps and a 7 pin plug. No signal to the tell tale.
3. A brand new trailer, incandescent lamps, 13 pin plug. Today it was working perfectly turning right, but nothing turning left!

JWL - I think I'll give cleaning the 13 pin socket on the Defender a good clean, and also the 13 to 7 pin adapter I use.

12th Oct 2016 7:54pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20304

Try adding a temp earth too whilst your at it and see if there is any difference. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️

12th Oct 2016 8:26pm

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