test dynamo

[Peter Gee]

Looking at the dynamo brushes end on, how do you tell D wire from the coil to F? Mine are unmarked and I must rebuild..which one is left  or right?

Cheers

[trevinoz]

When I rebuild I connect the left brush to D, the right brush to earth.
The coil leads are brought out so that the left goes to earth and the right to F.
I motor test and if the direction is wrong I reverse the coil leads by bringing them out of the opposite slot.

[morris]

Looking at the dynamo brushes end on, how do you tell D wire from the coil to F? Mine are unmarked and I must rebuild..which one is left  or right?

Cheers

Trevinoz beat me to to it but I was going to reply in the same sense.
If they are the wrong way round it won't charge so just swap 'em then

[Tumbleweed]

Yes Bill it was as you say running the wrong way I was reading anti clock from the front the dynamo body was the wrong way round the arrow points the other way ,  now its charging well .  thanks everybody   TW 

[groily]

It's easily done TW. Happens all the time. All this patting head and scratching belly stuff (the one being a bigger target than the other, don't go there please) makes it dead easy to get things wrong, especially when the arrows mean sod all on most of them 50 years down the line.
The good news is it works and no harm done. Long may it continue  . . .