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Ammeter Question

R

RetChief2

New User
Just acquired a 1948 8n. While going over it I noticed that the ammeter was showing a negative charge when throttled up. Thought, ?Ok, wired are reversed?. So I opened the top and, WHAT, no wires running to ammeter posts! A small harness was attached to a clip on the bottom of the alternator but no electrical connection. Added to that the tractor has been converted to negative ground.
So, is it possible the ammeter is inducting current from the harness?
And the bracket attaching the alternator to the chassis touches both posts so how could I even wire the posts?
I?ve run wiring for accessories on off road vehicles but I?m stumped.
 
It's an "inductive Ammeter" and simply "reads" the strength of the magnetic field in the wire and displays it as Amps.

Remove the wire from the clip and flip it around so it passes through the clip in the opposite direction, and the Ammeter will read correctly.
 
Yep, OEM N-Series and beyond tractor AMMETERS were Induction Type, LOOP STYLE. However, the first 4000 9N's used a -20/+20 amp gauge that used 4 screw terminals; 2 for wire connections, 2 for mounting the dash to. Then FORD declared them obsolete and released the -30/+30 Induction 'LOOP" Style Ammeter and used up thru the HUNDRED SERIES Models. To get the loop style from reading backwards, you simply need to reverse the direction of the wire thru the loop. Try that. You can test an induction style by running a magnet over the faceplate. If good, you will see needle movement.

FORD TRACTOR 9N-10850 (A) -20/+20 AMMETER w/4 SCREW TERMINALS, USED ON FIRST 4000 9N?S ONLY:
j4aWPDqh.jpg


FORD TRACTOR OEM 9N-10850-B LOOP AMMETER & AFTERMARKET TERMINAL STYLE:
b0h27j1h.jpg

Tim *PloughNman* Daley(MI)
 
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