charge light

[steveo]

picked up a 78 r80/7 for a good price this week, it had been sat for a year in an underground garage. she fired up first time with a good battery but the charge light is on all the time . electrics is not my strong point ! so could anyone give me some ideas of the best place to start looking for the problem that would be great, many thanks, steve

 

[cookie]

Check the alternator brushes and continuity of the rotor winding.

 

[(RIP) maverick]

I had a similar problem with a R100T.

Replaced the rotor, brushes and diode board - still the same.

Voltage regulator of £18 sorted the problem I would start with that first. If you can borrow a voltage regulator off another bike or test it, see if the light goes out and if notwork towards everything hidden under the front cover i.e. brushes, alternator rotor etc

 

[(RIP) Bin Ridin]

Light will be off if rotor open circuit, the fecker.

 

[steveo]

thanks , yes, i have a g/s, would the voltage reg be the same?

 

[(RIP) maverick]

thanks , yes, i have a g/s, would the voltage reg be the same?

Yes should be, is exactly what I swapped with to
check mine

 

[steveo]

Yes should be, is exactly what I swapped with to
check mine

thanks maverick, the 80/7 is in a few bits now as the PO was going to bob it,looked bloody awful and hes chopped 2 inches out the sub frame,so another is sought or put inches back in,got all standard parts from him yesterday. i ll give the swap a go when its all back together. cheers, steve

 

[cookie]

I appear to have misread the original post. My money would be on the diode board.

 

[steveo]

cheers cookie, i have a spare one of those.