Join Date: May 2005
Location: Scotland Edinburgh
My Motorhome: Niesmann Bischoff Flair
Thanked 27 Times in 20 Posts
Welcome to the forum. I also have an Iveco motorhome and tow a car behind. I suffer from the same issue as yourself, I have spoken to both the converter of the car and Iveco. Firstly, I assume the towcar is wired in such a way that the lights on the towcar operate at the same time as the motorhome? Iveco inform me that the system is set up for a "traditional trailer" containing traditional lighting circuits with traditional amount of bulbs. The system in our van is set to measure the resistance of these bulbs. If a bulb fails the resistance in the circuit increases and the system warns that you have a faulty bulb and indicates that by the warning indicator and the LCD message. Unfortunately, the resistance of the bulbs in the towcar is higher than expected, so it detects a fault. The company who modified my car, Towbars 2 Towcars who are the industry leaders in this type of technology in the UK offered to fit a resistor into the circuit to create the expected Iveco resistance and clear the issue. The problem I have is more complex in that I tow a Mercedes SLK which has a Can Bus wiring system, so all the voltages coming from the motorhome have to be stepped down through voltage reduction boxes and my lights are made up of 3 independent strips on each function, be it brakes, sides, indicators etc.
I have a more annoying issue in mine due to the indictor circuit also having a higher than expected resistance, the indicator warning and flashing on the dash is twice as fast to warn of the issue, however, the actual indicators still flash at the correct speed.
I don't see it as a huge issue and I am used to it. It was only a very minor issue in the huge challenge that Towbars 2 Towcars undertook to convert this type of car to tow, and did an excellent quality job.
I recently had issues with the wiring loom feeding the trailer ECU connection which had got wet and had corrosion. Iveco replaced the complete loom and ECU under warranty and when testing I explained the issue and Iveco confirmed what I have typed above.
Hope this helps a little!