1977 r75/7 Generator light not working

Mike McAllister · 2024-01-06T05:40:38Z

Hello everybody! Been a while since Iv'e been here. Just acquired a r75 thats been sitting for 10 years with hardly any use. So as you know there is quite a bit of TLC to do. One problem is the generator light is not coming on and as a result no charging. I have been doing a lot of research and dong a lot of different tests per Rick Jones book. I did find a bad diode, but I don't think that has anything to do with the bulb. Removed the dash and checked the bulbs themselves which are good. Found corrosion on the bulbs and seats and cleaned them the best I could. Checked the wiring from the diode board to the headlight shell. Still no light. The oil light works, but not the generator, neutral light, blinker indicator light and brake reservoir light. The tack light works as well. Any ideas out there? I know I can bypass the generator bulb with a resistor, but it doesn't really fix the issue and you don't have a light. Might have to resort to it tho. Battery is fully charged also. Thank you, Mike ABC 14174

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chris stone

(@noblenobby)

Posts: 17

Active Member

hi mike

I rebuilt my loom my self, Although I have r100gs same sort of thing, I replaced the wire from B+ from diode board to starter motor with A much thicker wire AWG 6. I have 14.2 at 2000 rpm I have stock alternator, with Thundercat diode board. replace three wires from alternator to diode board and I fitted extra ground wires from diode board to engine block. A lot of problem could be from resistance from old connectors and old wire

cheers chris

Posted : 01/12/2024 14:08

Mike McAllister

(@14714)

Posts: 11

Active Member

Topic starter

Thanks Steve! I will probably doing just that. I didn't know about replacement housings.

Posted : 01/13/2024 22:35

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