| Author | Message | ||
     Clodeb |
HiEverybody Just bought that nice Ulysse 08 with 15000m. Problem is horn and rear brake light dont work..i check the fuse and it was burn. I change it but still dont work and fuse is ok. Any advise where to start checking before i loose my nerve and go to dealer. | ||
| Reepicheep |
That's low milage for an 08... so I would look for mice. Seriously. Pull off the flyscreen, look in there, and look back up in the tail section. Mice will chew through the tail light wire insulation for reasons I'll never understand. It's not like there is a shortage of plastic in the world. Don't ask me how I know... | ||
| Clodeb |
So far no mice..but when i applied front brake tadam fuse burn,so i disconnect both connector and with my tester with sound i have a ground on both the orange and red w yellow . I remove front cover to follow the cable and it is nice and going into the big cable toward the rear.....what next please | ||
| Clodeb |
Also with the front brake disconcted i have with switch on power on orange and strangely ground on that same orange when power off!! | ||
| Reepicheep |
Looking at the 2008 schematic, then I would say both of those wires are shorted to ground. Which seems odd. Unless both were ground when the front brake was applied (which closes a switch connecting them). Are both those wires grounded without the brakes engaged? | ||
| Clodeb |
yes brake disconnected...front | ||
| Clodeb |
Also when i unplug the rear tail light i have 12v on the red yel wire in the harness plug when i applied foot brake wich seem ok and fuse dont blow and also horn is working!! And with front brake still disconncted | ||
| Reepicheep |
Does the horn work with the front brake disconnected? | ||
| Reepicheep |
I'm thinking the yellow and black wire is shorted to ground, and the fuse blows when you try and sound the horn. Which would include the horn itself just shorting to ground. | ||
| Clodeb |
Another strange thing with the front brake disconnected from the 2 wires. switch on orange 12v and when i applied foot pedal i receive 12 on the red yellow so if i connected those 2 wires to front brake switch and applied it i have 2 12volts facing each others!!! not normal i thing that 2 sources meet together i am wrong and clear | ||
| Clodeb |
yes the horn work and rear tail light with foot pedal without blowing the fuse and not using front brake | ||
| Reepicheep |
Then the only possibility I can see (based on the schematic) is that the front brake switch or wiring near the switch is grounded, and that when you disconnected the connector you eliminated the short. With the back brake applied, both sides of that front brake switch will be +12v. Without the back brake applied, the yellow and orange wire will be grounded through the brake lamp filament (maybe 10 or 15 ohms?) | ||
| Reepicheep |
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| Akbuell |
OK, one fuse and a both common and separate circuits. A wiring diagram is Really useful. Re the horn: Current flows to and through the fuse, then to the left hand controls where it 'waits' until the horn button is pushed. Replace the fuse. Go to the horn and disconnect the Y//BK wire and connect the multimeter. Push the horn button w/the ign on. You should get 12V, and the fuse should not blow. If the fuse blows, there is a short to ground in the Y/BK wire. If you don't get 12V, there is an open in that wire, or the horn switch is bad. If you get 12V and the black wire is well connected to ground, the horn is bad. Re the brake light: Again, power goes from the fuse to the brake light switch(s) and 'waits' until it is needed. Go to the tail and unplug the connector at the tailight assy. Connect the multimeter to the R/Y wire. With a good fuse and the switch on, push the rear brake on. If you don't get 12V, AND the fuse doesn't blow, the switch is bad. If the fuse blows, there is a short to gound somewhere in the R/Y wire. If the fuse blows when the front brake is applied, and does not blow when the rear brake is applied, there is a short to ground in the R/Y wire and the rear brake switch is not working. Hope this helps, Dave | ||
| Akbuell |
LOL. This will teach me to leave the computer on and go do stuff and do research and reply without hitting the refresh button first ! And thanks much Reep for the diagram, it helps a lot. If things work and the fuse doesn't blow with the front brake switch disconnected, then the problem is in the front brake switch. The R/Y wire is shorted to ground somewhere. Looking at my '08TT, I'm going to say the switch is shorted internally to ground; if the problem were somewhere else in the R/Y wire, the fuse would blow when the rear brake was pushed. Hope this helps, Dave | ||
| Clodeb |
Oh my god what a nightmare...went for a ride this evening with the 2 wires disconnected from front brake and everything went well rear brake pedal and horn are ok and fuse dont blow. I will investigate later with the front switch and dismantle it.. thank you both of you for your professional advises. | ||
| Reepicheep |
No problem! Electrical problems can be a hassle to chase down, but they are usually cheap and easy to fix. So 95% of the job is diagnosis. | ||
| Akbuell |
Good to hear the problem has been located. Replacing the switch is probably the most efficient solution. And you are very welcome; glad to help. Dave | ||
| Terrys1980 |
The switch is not likely to cause a blown fuse unless it has a complete meltdown or is full of water. It is single wire in and out. If I had to guess, then likely the wiring between the left and right switches or to the main harness. (Message edited by terrys1980 on July 29, 2016) | ||
| Reepicheep |
I was thinking the same thing about the switch. It would be REALLY unusual for it to fail as a short to ground. But if it was too deep in the wiring harness, disconnecting the switch wouldn't help anything, as the hot for the tail light is just wired right into that side of the wire. So I'm thinking the wiring that "moves" when you disconnect the plug from the switch. Or it's just a really unusual switch failure (every odd thing happens sometimes). | ||
| Clodeb |
Well i am thinking if i just connect a regular on/off toggle switch instead of the front brake and if the fuse burn then i will search further into that lead toward the bike! |
