Technical light problem

[paflo]

Hello. I had a problem with my lightswitch. When I turn on the lights no response no lights. This was caused by de small switch in de steering switch unit. The small switch was completly melted. After changing the switch unit al workes very well. The problem is the high current on de small switch because it is a motorhome with extra lights. Now I will change this by using a relay instead of the small switch. Is there somebody who has done this and can tell me which wires(pins) I must use or has a wire diagram how to do this? My motorhome is a Hobby 600 based on a fiat ducato x244 from 2004. I hope someone can help me.

 

[Communicator]

Hi paflo,

I assume that it is the side and rearlights diagram that you require. I will attach Fiat eLearn diagram E2010. Following the sidelight circuit through the ignition switch is not easy. To help my understanding I have made my own diagram of the ignition switch. If using it, note that there is a cicuit across my diagram where there is a solid square. I also think that my LHS cab fusebox diagram should help. I fitted an extra relay to release the cab windows when parked, via an external timer, and push button.

If you have only one circuit for your additional lights, I suggest operating your relay from F24. You could obtain a supply for your lights, by adding the connection insert at thbottom of F36 as I did. By adding inserts to one of the spare relay locations you could locate your relay in the fuse box, but probably easier outside of the fusebox. You would need to extend the relay coil -ve to an earth and find/reroute your extra lights connection to the relay.

Warning the inserts for the fuses are relatively easy to remove, and the inserts for the relay coils are possible, but I have failed when trying to remove the larger relay contact connecting inserts. That is the reason for my suggesting an externally mounted relay.

 

[paflo]

Thank you very much for your reply. The drawings are very helpfull. I am thinking of your suggestion using f24 for the coil. I think I have to cut the wire on pin 6 of the swith unit. Then bring the wire from f24 to pin 6 so the coil of the relay can be operated bij the small switch. And then the other end of the wire will be connected to the relais 87. And 30 to earth. Or something like that. I asume that for locations of fuseboxes there is no difference between a lhd or rhd.

 

[Communicator]

Thank you very much for your reply. The drawings are very helpfull. I am thinking of your suggestion using f24 for the coil. I think I have to cut the wire on pin 6 of the swith unit. Then bring the wire from f24 to pin 6 so the coil of the relay can be operated bij the small switch. And then the other end of the wire will be connected to the relais 87. And 30 to earth. Or something like that. I asume that for locations of fuseboxes there is no difference between a lhd or rhd.

In my reading eLearn wiring diagrams only show the LHD version, particularly evident with electric window switches. We RHD usere have to make guesses, so no problem with fusebox location.

I was thinking that you would supply your additional lights from a separate fuse.

Please note the following automotive relay connections. Your mention of connecting 30 to earth seems wrong.
86 Coil +ve
85 Coil -ve
30 Supply from fuse
87 Load

Have you considered changing bulbs in additional lights to LEDs? Current taken will be much less, and probably no large inrush of current when switched on, which occurs with incandescent bulbs.