Okay recap. I double checked the starter box and its affirmative that a wire came loose. theres a cover in there being held in by a single screw. i took the cover off and out came the 4th wire hanging there. i'm gonna re solder it in the morning and all should be well.

 

what are your symptoms? do u have signals, brake light ect

 

I just bought a 03 cbr f41. The headlights don't work at all and the screen is blank where the gas gauge should be.
I knew it had these issues when I bought it.

I was riding today and hit a good bump, the lights and gas gauge started working perfectly for a few hours a and then stopped working again,without hitting any bumps.


Checked the fuse already

The highbeam light does not come on either, but it did for a while after hitting the pothole.

From the posts it looks like maybe a bad ground, or starter switch box (whatever that is)

If anyone could tell me where to find such a box it would be much appreciated. I will probably check the ground wires first.

 

If your lights work after you hit a bump you obviously have a loose connection somewhere. Check the starter switch box for a loose wire as stated. You say you don't know where to find it?? well hmmmm...

To start your bike and get your starter to click on, you insert the key and then turn the key, then you press the starter switch with your right thumb....find it yet?? remove the 2 screws from the bottom and open it up, you'll see 4 wires soldered onto a very small panel, i bet one of them is hanging loose.


Also F4is don't have fuel guages. only 4 reserve bars. Use your trip odo to keep track of miles.

 

Thank you for the quick reply but I was too busy to follow up.

I took apart the switch box today and everything was fine. No bad connections.

Still have no headlights or gas meter. Taillights and turnsignals are led aftermarket and work fine.

So obviously a loose connection somewhere...

 

I tracked the problem to a connector in the wiring harness. It's the 6 prong black plug under the rubber boot, behind the front cowling. There is some corrosion and when I wiggle the plug the lights come on.

 

I was mistaken it is the 7 prong black connector. More specifically the yellow/red wire, which from the wiring diagram goes to the "starter switch box".

Great job with the diagnosis, and thank you for the quick reply on my first post. I will try to keep the stupid questions to a minimum.

 

Bumping an old post but, THANK YOU! I was having the same problem and this was the exact issue. Soldered it back on, threw some liquid tape over it and perfect. I'm not sure I would have looked for this issue. I had assumed it was something to do with the HID's on the bike since we noticed those going on and off first.

 

My headlights went out the other days. Discovered the loose wire in the starter unit. Soldering is going to be a pain.

Thanks for the help folks.