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Old 24 August 2013, 08:21   #71
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Ahhh, once again the advantage of Ribnet.

The light dawns (see what I did there?)

So, more questions.

Can I just get a suitable resistor (6k ohms ?) and "bang" it in the cable somewhere out of harms way. Or should I buy a dedicated box at greatly inflated cost?

Any experience anyone?

Thanks as always

Ian Wilson
If you read through the thread, there are links to suitable resistors & how to fit them. As Bigmuz says, the make & model of vehicle is very relevant.
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Old 24 August 2013, 09:40   #72
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Volvo XC70 2007 model

Fitted with Volvo wiring harness.

Currently when I plug it in the indicators come on dull, only 2 or 3 less on rh side light, nothing on left. Brakes and fog are fine.
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Old 24 August 2013, 10:16   #73
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Originally Posted by j.i.wilson View Post
Volvo XC70 2007 model

Fitted with Volvo wiring harness.

Currently when I plug it in the indicators come on dull, only 2 or 3 less on rh side light, nothing on left. Brakes and fog are fine.
That sounds more like a bad connection rather than an electronics issue, Try putting 12v +ve directly to pins 1&4 (yellow & green) & -ve to pin 3 (white)
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Old 24 August 2013, 10:23   #74
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Agreed.

However I have tested everything with a little test rig I made. All is well with no cross connection between indicators and side lights.

RH side light is definitely faulty and I have requested a replacement from the seller.

But why the indicators come on when plugged in is still a mystery.

Intend to strip car side plug and investigate.

The reason I am interested in resistors is because the tell tale on the Volvo dash does not operate with the indicators and, annoyingly, the reversing sensors still operate when the led's are pugged in. This doesn't happen with caravan with ordinary bulbs.

Don't you just love trailer electrics (and brakes!).

Ian Wilson
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Old 24 August 2013, 12:46   #75
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But why the indicators come on when plugged in is still a mystery.
Ahh! tell me more do the LED indicator lights come on as soon as you plug them in, but only very dim?
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Old 24 August 2013, 13:05   #76
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Quote:
Originally Posted by j.i.wilson View Post
Agreed.

However I have tested everything with a little test rig I made. All is well with no cross connection between indicators and side lights.

RH side light is definitely faulty and I have requested a replacement from the seller.

But why the indicators come on when plugged in is still a mystery.

Intend to strip car side plug and investigate.

The reason I am interested in resistors is because the tell tale on the Volvo dash does not operate with the indicators and, annoyingly, the reversing sensors still operate when the led's are pugged in. This doesn't happen with caravan with ordinary bulbs.

Don't you just love trailer electrics (and brakes!).

Ian Wilson
They might be ok .. its just some cars react differently to them, which makes a single solution all the more difficult, and yes the plugging in of a trailer causes many things to change, disconnecting a fog light is basic .. now were into giving the rear suspension extra air pressure and altering the gearbox shift pattern, which is why LED's may not be good if the car doesent know something is connected to the tow hitch
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Old 24 August 2013, 13:25   #77
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Ahh! tell me more do the LED indicator lights come on as soon as you plug them in, but only very dim?
Yes - exactly like that
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Old 24 August 2013, 17:30   #78
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Yes - exactly like that
Sounds like a bulb failure system, the car puts out a low voltage to "hunt" for the indicators, the voltage isn't high enough to illuminate a conventional filament bulb, but the car detects the resistance & "sees" the bulb. This tells the car that the trailer is connected, & car goes into "trailer mode". The LEDs present a higher resistance than a filament bulb so the car doesn't see the trailer, however the search voltage is sufficient to cause the LEDs to glow. I think its worth trying resistors in // with the indicators if you're determined/capable enough to have a go.
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Old 25 August 2013, 00:28   #79
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Thanks for that.

Going to check trailer socket on car just to be sure. Then will fit resistors to trailer side.

Also thinking about having a chat with the Main Stealer, but that may be a frustrating experience.

Thanks again for the insights.

Ian W

Sent from my HTC One X using Rib.net
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Old 25 August 2013, 15:25   #80
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I have been told some cars have to go to the dealer and they reprogram the computer for trailer harness use
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