40 ford volt guage

2manycars

2manycars

Well-known member
Is there a way to calibrate the volt guage on the 40 ford? Mine points to just between the yellow and red, while a meter says 6.5 volts.
 
I would guess that your gauge is reading correctly in the yellow at 6.5 volts which is really only static battery voltage with engine not running. It should be in the green with engine running and revved up to 2000 RPM and generator will be charging at 7.2 to 7.5 volts. The generator will not be charging at engine idle speed. Regards, Kevin.
 
Maybe I should have the generator checked. The guage reads between the red and yellow while at speed.
 
Copied from Flat Ernie post on the HAMB:

EDIT: Found my service bulletin book. You should have the following colors from left to right - red, orange, green, red. (I guess the orange on mine is faded to yellow)

Top of first red range/bottom of orange range = 6.2V
Top of orange range/bottom of green range = 7.1V
Top of green range/bottom of second red range = 8.25V
 
JSeery said:
Copied from Flat Ernie post on the HAMB:

EDIT: Found my service bulletin book. You should have the following colors from left to right - red, orange, green, red. (I guess the orange on mine is faded to yellow)

Top of first red range/bottom of orange range = 6.2V
Top of orange range/bottom of green range = 7.1V
Top of green range/bottom of second red range = 8.25V
Click to expand...

Thank you. That is very helpful.
 
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