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Misc: Charging Systems Miller Ammeter, needle off zero adjust

craig

Well Known and Active Website User
VOC Member
20210305_MillerAm1.jpg

My Miller No.75 ammeter will not return to zero and acts as if the slight magnetic field at zero is off to discharge about 1 amp.
Can this be adjusted and fixed?
Bending the needle looks like certain failure.
Thanks
Craig
 
Solution
View attachment 40850

My Miller No.75 ammeter will not return to zero and acts as if the slight magnetic field at zero is off to discharge about 1 amp.
Can this be adjusted and fixed?
Bending the needle looks like certain failure.
Thanks
Craig
Craig,
get yourself a horseshoe magnet, put it crosswise at the back of the Ammeter. You can now control and centralise the needle, then gradually pull the magnet straight backwards away from the Ammeter.
I've done it many times, and it's worked for me.
Cheers, Delboy.

greg brillus

Well Known and Active Website User
VOC Member
Craig, you can bend carefully the small piggy tail device down the bottom, which I think is like a counterweight one way or the other and this will shift the needle position.
 

delboy

Well Known and Active Website User
VOC Member
View attachment 40850

My Miller No.75 ammeter will not return to zero and acts as if the slight magnetic field at zero is off to discharge about 1 amp.
Can this be adjusted and fixed?
Bending the needle looks like certain failure.
Thanks
Craig
Craig,
get yourself a horseshoe magnet, put it crosswise at the back of the Ammeter. You can now control and centralise the needle, then gradually pull the magnet straight backwards away from the Ammeter.
I've done it many times, and it's worked for me.
Cheers, Delboy.
 
Solution

craig

Well Known and Active Website User
VOC Member
Thank you Delboy, I did just this fix, except I brought a magnet to the front of the horizontal coils the needle centered and then I backed off the magnet and now it is pretty well centered.

Amazing result, thank you
Craig
 

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