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Loss of power at permanent live and ignition live pins

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Old May 16th, 2019, 08:06   #21
Simon J
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Here’s the relevant page from the instructions.
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Old May 16th, 2019, 11:53   #22
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Here’s the relevant page from the instructions.
It's a mystery , yours must be a very early car or prototype kit all the volvo wiring diagrams point to the 13 pin loom wires as being white ...

anyway do your tests and see what you come up with ...
you need a solid 12v capable of lighting a headlamp bulb feeding the trailer module .
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Old May 16th, 2019, 12:40   #23
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It's a mystery , yours must be a very early car or prototype kit all the volvo wiring diagrams point to the 13 pin loom wires as being white.
Here’s the link to Volvo's accessories and the instructions for fitting the cable harness I bought which clearly show the individual wires are coloured as per the 13 pin socket colours - https://accessories.volvocars.com/In...utomatic/R.H.D

I’ll finish the rewiring of my trailer and then connect it to the car and see what happens. Presumably the red power feed is a constant 12 volts so that the trailer lights work even with the ignition off?
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Old May 16th, 2019, 12:55   #24
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Here’s the link to Volvo's accessories and the instructions for fitting the cable harness I bought which clearly show the individual wires are coloured as per the 13 pin socket colours - https://accessories.volvocars.com/In...utomatic/R.H.D

I’ll finish the rewiring of my trailer and then connect it to the car and see what happens. Presumably the red power feed is a constant 12 volts so that the trailer lights work even with the ignition off?
Yes constant feed to the trailer module
No , the trailer module supplies an output to the relevant trailer lights when it gets told to by the car's computer network system . The trailer module listens for commands from the car to switch the trailer lights on or off . It will probably not work if the Caravan has LED lamps ... This was allowed for from about 2012 ..
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Old May 16th, 2019, 13:09   #25
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Thanks. Since the lights are presumably powered via the feed to the trailer module it needs to be constant 12v so that the trailer lights can work with the ignition off (which they do).

The instructions for the trailer module specifically state that it won’t work with LED lights on the trailer.
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Old May 17th, 2019, 08:57   #26
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Related to this issue of pin 9 and pin 10, pin 9 (permanently live) is protected by the 15 amp fuse 77 but is pin 10 (ignition controlled live) protected only by the 40 amp fuse 14? I want to provide a charging supply to the trailer battery that only kicks in once the engine is running. The easiest way to do this seems to be to fit a voltage sensitive relay (VSR) on the trailer to pin 10 and use the output from this (with a 15 amp fuse) to charge the battery. Alternative I could use the output from the VSR to trigger an ordinary relay to connect the output from pin 9 to charge the battery. The latter setup replicates the 'habitation' relay in a caravan but seems unnecessary for the specific purpose I have in mind. Is there any reason not to use pin 10 to directly charge the battery in this way?
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Old May 17th, 2019, 13:55   #27
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Related to this issue of pin 9 and pin 10, pin 9 (permanently live) is protected by the 15 amp fuse 77 but is pin 10 (ignition controlled live) protected only by the 40 amp fuse 14? I want to provide a charging supply to the trailer battery that only kicks in once the engine is running. The easiest way to do this seems to be to fit a voltage sensitive relay (VSR) on the trailer to pin 10 and use the output from this (with a 15 amp fuse) to charge the battery. Alternative I could use the output from the VSR to trigger an ordinary relay to connect the output from pin 9 to charge the battery. The latter setup replicates the 'habitation' relay in a caravan but seems unnecessary for the specific purpose I have in mind. Is there any reason not to use pin 10 to directly charge the battery in this way?
Yes pin 10 has the 40 amp fuse but i daresay there is electronic protection in the trailer module as it will be switched by a transistor device .
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Old May 17th, 2019, 20:29   #28
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Well, whatever the problem was, it seems to have resolved itself! I connected up the trailer using my new 13 pin plug and cable and everything worked including pin 9 permanently live and pin 10 going live once the ignition is switched on. I’ve connected pin 10 on the trailer to a voltage sensing relay which works as expected, i.e. no voltage output until the engine is running and the alternator is putting out 14+ bolts. So that’s what I’ll use to charge the trailer battery.

I can only assume that without the trailer being attached the trailer module doesn’t send power to pin 10 although in the past I was able to measure 12 volts at pin 10 in the towbar socket. But whatever, it now works.
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