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DISCO3.CO.UK > Technical (D3)

Tow electric problems

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BCP

Member Since: 25 May 2005
Location: East Scotland
Posts: 1464

2016 Discovery 4 3.0 SDV6 Commercial Auto Loire Blue

Tow electric problems

Trailer brake lights won't function. After 2 hours of changing bulbs and checking connections, I gave up. Checked D3 tow fuses and all well. Took trailer to autoelectrician who pronounced the trailer healthy but there is a problem wiith the car. Seems to be no power to the brake light fuse.

These are dealer installed electrics with no previous problems.

Anything I should check before taking in for a dealer check?
Thanks, BCP

19th Jun 2007 8:08 pm

Gareth
Site Moderator

Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26699

Loose plug behind left hand rear lamp?

19th Jun 2007 11:01 pm

catweasel

Member Since: 05 May 2006
Location: Bundaleer
Posts: 4805

Re: Tow electric problems

BCP wrote:
Seems to be no power to the brake light fuse.

have you checked this with a meter (the ignition needs to be in pos 2 I think and the brake pedal depressed to have power at the trailer brake fuses). there is a connector to the trailer fuses try that or try the connector above the brake pedal. I assume your brake lights on the D3 are working so no need to check the fuse in the CJB (or are they ?)

20th Jun 2007 4:05 am

BCP

Member Since: 25 May 2005
Location: East Scotland
Posts: 1464

Yes power checked with a meter. It is a bit strange as they were working until a week ago. According to the manual there don't seem to be any other fuses apart from the tow electric fuses.

BCP

20th Jun 2007 8:46 am

Wonky

Member Since: 28 Nov 2006
Location: Brill, Aylesbury
Posts: 354

2007 Discovery 3 TDV6 HSE Auto Stornoway Grey

Just one possibility, if there is power at the socket it is probably just a poor connection between the pin and the receiver. Try gently opening the pin up and cleaning the outside with some fine emery and also cleaning the inside of the corresponding receiver. Switch cleaner would also help.

Martin W 07MY TDV6 HSE Stornoway Grey + Alpaca
No ugly kid glass!
Side steps (one with dent!)
BIG GRIN (although turned down at the edges)
Extremely empty wallet

20th Jun 2007 9:27 am

catweasel

Member Since: 05 May 2006
Location: Bundaleer
Posts: 4805

fuse 15 in the CJB is for the brakes, if your brake lights work then it is ok. have you checked for continuity to one of the brake lamps to fuse 1, green with a purple stripe as there are a couple of splices in that cct.

20th Jun 2007 10:08 am

BCP

Member Since: 25 May 2005
Location: East Scotland
Posts: 1464

Having a monsoon here this morning. Have wimped out of auto electrics for the next hour or so! Thanks for the pointers.
BCP

20th Jun 2007 10:10 am

ronp

Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15213

2014 Discovery 4 3.0 SDV6 HSE Auto Corris Grey

Cable hasn't been chaffed away by the swinging chassis weights ?? 🏴󠁧󠁢󠁳󠁣󠁴󠁿

20th Jun 2007 10:15 am

BCP

Member Since: 25 May 2005
Location: East Scotland
Posts: 1464

I wondered about that and planned to get under the car this am but deluge prevents this. If it's not an obvious fraying our loose connection at the tow fuse box it will need to go back.

BCP

20th Jun 2007 10:21 am

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