Battery connection on new-to-me 1974 MKII Commando

Status
Not open for further replies.
Thomasa said:
It seems unlikely to have been converted to negative ground. If one were to convert to negative ground would you not need to reverse the zener polarity?
Click to expand...

You would, and the previously mentioned rectifier.

Thomasa said:
The stud would have to be electrically isolated from the frame/z-plate and a wire run from the stud to the rest of the electrical system. But then you'd lose the heat sink. That would be a dead giveaway... unless there is a negative ground Lucas zener that I don't know about, which is entirely possible.
Click to expand...

Yes, the 1979-on negative earth/ground non-electric start* Triumph twins had a low-output 3-phase RM24 and negative earth/ground (Lucas 49589) Zener.

*(The electric start models had the high-output 3-phase RM24 and negative ground 'AC' triple-Zener assembly.)
 
Are the Triumph zeners still available? I've heard that the positive ground ones are not.
 
Thomasa said:
When you do finally put the battery in, invest in the factory hold-down and the associated rubbers. They are available and not expensive.
Click to expand...
Velcro works great and is a decent isolation for vibration. Apply velcro on the bottom and rear.
 
Status
Not open for further replies.
Back
Top