Hi, I noticed my headlamp not working on my 2001 California EV1100, the main beam also isn’t working nor the tail-light. I checked all fuses and ok, I have a Gutsibits workshop manual and it lists a light relay but doesn’t show which one it is (see photo) If someone knows which one it is i’d appreciate the help.
Or any other thoughts of what it might be
Not working
Main beam, Dip beam, Rear light, Sidelight, instrument lights
Working
Brake lights, indicators, horn, warning lights, bike starts and runs ok
@Chris950s does wiring diagrams for many bikes, I’m not sure if he has done your model?
The other place to look is on The Guzzitek for manuals, wiring diagrams etc.
I’ve posted something similar on other threads, but actually, relays are consumables. Electrics, like mechanicals, need maintenance. Sometimes relays get burned contacts and connect voltage, but won’t pass the current. They wear.
They’re almost 25 years old. Just replace all the relays. You’d change the oil if it was 25 years old. You’ll be grateful.
I agree with Andymay. Swap out all you Relays to Bosch. This is a std upgrade for these models anyway and may solve your problem. If it doesn’t solve the problem, i’d take a look at the Light Switch or the power supply to it!
Take out fuse 3 and check it is not blown, if not then clean the contacts or swap with one of the same amperage.
@Don-Spada Yes Don I have drawn this model and copies are available, (see here) however it has an ECU and I shy away from drawing these as they are much more complicated. Maybe when I finally retire… watch this space!
Try with a meter to see if you have power going to the corresponding fuse and then trace things back and forth from there following the wiring diagram.
Most Guzzi’s have a big multi block connector under the tank which can corrode and loose some contacts.
All of the things that are not working are on the same circuit supplied by the same fuse, on the diagram I have it is fuse 3. It is supplied by a red wire from the battery and has a grey wire at the other side. This goes to the lights relay, when activated the power goes to the lights switch, brake light switches clocks etc via red/black wires. Start at the battery connection to the fuse and test for power with a multi meter or a bulb with wires attached.
If all of the above are not working at the same time it will be very near the source and not further into the loom.
You’re dead right, Chris. Start at power and trace it through.
But Guzzi wiring connectors have a habit of corroding very badly, turning into a green, powdery mess. I’ve had a fair few occasions when the multimeter indicates connectivity right the way through a system but the circuit won’t work because it won’t pass the current.
So, don’t get frustrated if you trace connectivity through the first time and it looks like it should work. If that happens you could switch the lights on and see where in the circuit the voltage drops off. It’s tricky to do. I use a pin stuck through the insulation at the point I want to test. Sometimes just sticking the multimeter probe in the back of the connector housing will make contact and tell you if there’s voltage on either side.
I’ve just had another thought. I was working on a ‘97 Cali 1100 once and found this. Original relays. The lights are one of the heaviest current draw circuits. We found the relays all had slightly burned contacts. By swapping them around you could find the least burned one that would enable the light circuit to work, and the worse burned light relay was still good enough to drive the lower draw circuit. Took us hours to work it out. Everything worked in the end, as a temporary workaround.
So, how much swapping relays around did you do ? If you were unlucky you might have swapped a badly burned one for another badly burned. It’s possible…
