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Old 15 January 2021, 16:12   #1
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Bypass relay

Trying to help a friend out I have only used plug and play looms in my cars but the cost is quite high itís only a basic unbraked trailer so 7 pin only.

Anyone recommend a relay? Assume it just splices into the rear light and pick up on other rear light for both indicators and a 12v feed for the relay?

Itís a Ford if anyone recommends one
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Old 15 January 2021, 20:08   #2
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I have no idea what you are talking about!
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Old 15 January 2021, 20:22   #3
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Old way before modern electrics for the 7N socket was to splice the socket's wires into the relevant wires at the rear light clusters.
No separate relay but might have had to replace the car's existing indicator relay with a heavy duty one.
My 1986 RRC was done like that by a previous owner using scotchloks (!) even though it has a 'plug & play' socket in the wiring.

Relay was used on the 7S to give power to the caravan internals.

Modern cars electrics can be easily upset so plug & play may safer.
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Old 16 January 2021, 09:15   #4
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Old way before modern electrics for the 7N socket was to splice the socket's wires into the relevant wires at the rear light clusters.
No separate relay but might have had to replace the car's existing indicator relay with a heavy duty one.
My 1986 RRC was done like that by a previous owner using scotchloks (!) even though it has a 'plug & play' socket in the wiring.

Relay was used on the 7S to give power to the caravan internals.

Modern cars electrics can be easily upset so plug & play may safer.
Plug and play is £230....plus coding to the car ecu .bypass relay is £8-£30

The bypass relay uses a splice into light cluster to trigger the trailer lights but they are independently powered so don’t upset the “modern electronics” by overloading the circuits they are common off he shelf units
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Old 16 January 2021, 09:20   #5
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I have no idea what you are talking about!
One of these for a Ford https://www.towsure.com/smart-7-way-...xoC_s8QAvD_BwE
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Old 16 January 2021, 16:47   #6
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Various sites with instructions for fitting the one in your link but no idea whether it's suitable for your friend's car.

May be better asking the question of the supplier or on a make/model specific website.
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Old 16 January 2021, 18:24   #7
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And there was me thinking I might get some useful responses from people who had experience with the subject ��
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Old 16 January 2021, 20:09   #8
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And there was me thinking I might get some useful responses from people who had experience with the subject ��
Obviously not many people use them.

Trailer lights are LED these days and draw stuff all power and installing one of those is only another thing that can go wrong.
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Old 17 January 2021, 05:12   #9
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Most here are still bulbs not LED, have heard some led can upset vehicle electronics
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Old 17 January 2021, 05:54   #10
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Click image for larger version

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ID:	136087

This usually fixes any issues if your car doesnít like LED trailer lights
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Old 17 January 2021, 06:00   #11
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Most here are still bulbs not LED, have heard some led can upset vehicle electronics
Common topic on later Land Rover sites!
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Old 17 January 2021, 06:05   #12
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Attachment 136087

This usually fixes any issues if your car doesnít like LED trailer lights


If youíre handy with a soldering iron, a couple of 21W resistors does the job too, costs around a fiver.
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Old 17 January 2021, 15:40   #13
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Attachment 136087

This usually fixes any issues if your car doesnít like LED trailer lights
£62 ??? Trying to save money here ......
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Old 18 January 2021, 04:46   #14
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And there was me thinking I might get some useful responses from people who had experience with the subject ��
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£62 ??? Trying to save money here ......
The tone of your posts are coming across as mildly condescending, you could always try and be a little politer, you might find your thread gets more attention, IMHO
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Old 18 January 2021, 05:15   #15
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£62 ??? Trying to save money here ......


Trying to save money and boats isnít the best combination 🤣
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Old 18 January 2021, 15:31   #16
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I've used one before a few years ago, worked fine. The issue has more to do with the tailight setup the car has than the trailer lights. There's always "fix-arounds" that'll resolve any issues on the trailer lights. I'd say the car will fall into three categories. Simple bulb tail lights...no problem. Tail lights with CAN bus monitoring. (Dash "Bulb out" warnings)...should still be ok if the relay specifies "CAN Bus" compatible. The other is vehicle with rear LED lights and now your creeping into dubious territory. I'd take the hit for the factory unit rather than risk blowing something on the car. I was at a local van hire company who rents out VW Amaroks and their trailer hookup electrics will only work with LED trailer lights. (Much to the fury of the customer who had just brought one back while I was in their waiting room) so it might not be that straight forward.

All just my opinion.
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Old 18 January 2021, 18:30   #17
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Thanks last tango, they are normal can bus lights so any canbus relay could be used. Was hoping for a recommendation for one as there isnít much obvious difference between the £8 eBay special and £30 units itís not my car but I might end up doing the wiring or advising by video
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Old 19 January 2021, 04:56   #18
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Thanks last tango, they are normal can bus lights so any canbus relay could be used. Was hoping for a recommendation for one as there isnít much obvious difference between the £8 eBay special and £30 units itís not my car but I might end up doing the wiring or advising by video


If itís a recentish model car, chances are that the loom is already in the rear of the vehicle & just needs a harness plugging in. Look on PF Jones.

https://www.pfjones.co.uk/towbar-wiring-kits.html
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Old 19 January 2021, 09:41   #19
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If itís a recentish model car, chances are that the loom is already in the rear of the vehicle & just needs a harness plugging in. Look on PF Jones.

https://www.pfjones.co.uk/towbar-wiring-kits.html
Its not and its £130 for copycat loom from PF jones plus coding from ford.
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Old 19 January 2021, 09:59   #20
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Its not and its £130 for copycat loom from PF jones plus coding from ford.


Looks like your mateís going to have to put his hand in his pocket then
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