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Hobbs hour meter 6V to 12V

H

Heath72

Member
I have an old Minneapolis Moline U that has a 6 volt Hobbs hour meter. It still works and shows 8220 hours. I recently converted it over to 12 volts while doing an overhaul and would like to keep it on the tractor. What kind of resistor might I use to make this work out? Would the resistor that you would use on the coil work out OK?
 
I can't say for sure about yours , but Hobbs' modern ones are 6 to 28 or even 50 volt , Does it have any markings on the back ?
 
The voltage dropped across a resistor is inversely proportional to the current flowing through it, and, most likely, the hourmeter doesn't draw much current so little voltage would be dropped across the resistor and the hourmeter would get near 12 Volt battery voltage (actually more like 14.5 Volts).

With today's electronics, there's all sorts of options to do it with regulated electronics.

If you GOOGLE "12VDC to 6VDC converter" you will find all sorts of circuits to build your own, or you can buy a ready-made starting at 10 bucks.
 
Just looked into that 7806. Looks like just the thing I need, and cheap too! Do the auto parts stores handle these or do I need to go to a electronics store? Thanks for the tip David.
 
Hey David I just googled it. The circut is dirt simple and can handle an amp of power. I would guess with intermittent power needs you could build this thing to fit in an old pill bottle. Neat little circut. If you still have a Radio Shack near you I would think you could buy everything there.
 
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