TT600 59X Brake light

[jagerb]

Hi guys!

I have a question about my recently acquired TT600 59x from 1989. The brake light isn't working, and i can't seem to figure out why. Does the brakelight run of the same stator coils as the head/taillight?(yellow/red stator wire) Or does is run of DC current from the battery like the horn and indicators?

The previous owner removed the horn, indicators, battery and ac -> dc rectifier.(i've tried connecting a 6v battery and still no current can be detected on the brakelight wires) And if it doesn't run on the same AC current as the head/taillight, can i just bypass the ac -> dc rectifier by plugging those 2 plugs together(red/white) to make it work? I disassembled and cleaned the brakelight switches and they are both in good working order.

Here's the wiring diagram, i hope someone can make sense of this :) :

Sorry about the italian, it's the only one i could find.

I hope someone can help me!
Cheers from Amsterdam

[scottieh]

Ciao bella! By all appearances of that wiring diagram, if your dash light (number 24 “strumento luce”) is illuminated then your brake/tail light should work too. And it appears that the tail light runs off the stator as the “y/r” wire connects to the “L” wire with the lights in the on position, but I may be reading that wrong.

Check your ground on the tail light. If neither the tail light or the brake light work then it may be a grounding issue.

[jagerb]

Thanks for the reply! Yes, the dash, headlight and the tail-running light are all working. But they are running on AC current from the red/yellow coil wires. By staring at the wiring diagram for many many times now, i think i've got things figured out. It looks like the white wires from the stator charge the battery via the rectifier(batteries don't like ac current :) ), and also provide current for the brake light, horn and indicators via the key switch. (although i don't have indicators and a horn) I guess they did this so your brakelight would still work if your engine died.

I hope this means i can bypass the rectifier, and totally get rid of the battery. This would (hopefully) make the brake light work on ac current. I'll see if i can make it work like this and i'll get back to you guys with the results!

[jagerb]

Turns out you can indeed connect bypass the regulator(and remove the battery) by connecting the red and white wire! Brake light works perfectly now.