instrument earths
Posted: Fri Mar 20, 2020 10:24 am
by Scottish888
Can anyone tell me how the instruments should be correctly earthed.
My bike has an earth wire just pressed in beside the bulb holder.
Should it be earthed on the mounting bolts?
Regards
speedo_edited.jpg
Re: instrument earths
Posted: Fri Mar 20, 2020 10:51 am
by graeme
I soldered an earth wire to the earth on each bulb holder then ran an earth to the main earth in the headlight.
I can only think the tach and speedo cables provided an earth to the frame originally.?
Graeme
Re: instrument earths
Posted: Fri Mar 20, 2020 4:42 pm
by blethermaskite
I have owned my 1974 350 mk3 from new, and if I remember correctly the instruments were both earthed through the rev and speedo cables, I am almost certain there was only a single skinny little black feed wire to each bulb holder. I have long since re wired the entire bike and fitted dedicated earths to each instrument exactly as Graham described.
Cheers,
George