Seeking help on trailer light issues

I'm not sure if this has been posted before but here goes. I have just replaced the trailer lights on my box trailer with LEDs. The right one has blinker, light, stop and a white led light for the number plate, the left one has blinker, light, stop and does not have a white led light for the number plate. My issue is - the yellow light on the instrument panel lights up only when I turn on the lights. The lights both come on, on the trailer and the number plate light comes on also. All the lights work perfectly (and also on my wife's Maxima). The warning light does not activate when I put on blinker, hazard or stop. As soon as I put on the lights, on comes the yellow dash light. The message on the panel says check right trailer light and another saying check left trailer light. Here is my question, Part 1 - because the voltage/current (I'm not that technical on the terms here) is different on the R and L lights does the car think there is an issue. Part 2 - can I fix the problem by adding a lead from the Left Light (brown wire) and connecting it to another white trailer light coming from the left light lead? (I would have to buy a single white light LED and put it on the other side of the number plate).
I hope I haven't made that too confusing. Any suggestions would be appreciated.
PS. I didn't try the trailer lights on the VW before I put on the LEDs, stupid I know. We have used the wife's car to drag the trailer around in the past. The LEDs work perfectly on both cars, just the warning light comes on on my VW.

That's most likely because the LED's current draw is low enough to make the VW's system consider a globe is out.

The fix would probably be a suitably sized resistor in each circuit — someone here will probably know what you'd need.

Great, thanks Idle. Here's hoping someone has the answer. It's an annoying little sucker, that yellow light.

I'd take it to an auto electrician to measure the draw from the LEDs versus the regular lights. He'll then be able to solder up a basic resistor to take the remainder of the current and prevent the car from seeing a lower draw.

Terrific, thanks. AdamD. I'll look through the Yellow pages and find one. I'll post results when tried.

---------- Post added at 05:43 PM ---------- Previous post was at 02:00 PM ----------

Problem solved.
I tried to ring an auto electricain, none open on Saturday arvo. My luck.
Then I thought about Idle and AdamD's suggestions.
I went to local Repco and they had an LED Load Resistor. Hooked it up to the Brown and White wires, BINGO. All fixed. Now the car alarm even goes off when I try to "steal" the trailer.
http://www.vwwatercooled.com.au/foru...IMG_0896-1.jpg
This a picture of the Resistor, packaged.

http://www.vwwatercooled.com.au/foru...IMG_0904-1.jpg
This a picture of the resistor fitted.

Thanks again to those who answered and offered advice.

Nice work mate - glad to see you got it sorted so easily!