6 v starter 12 v feed

Is there a voltage dropping circuit that will still allow a 6 volt starter to function properly on 12 v
with out harming the bendix drive or the ring gear? a some one mentioned in regards to a J/D set
up lower in the postings about one or two days ago.
 
Some use a very light gauge battery cable that's a lot longer than needed, which, in theory, causes some voltage drop, making the starter engagement less aggressive.
 
That doesn't sound feasible as the current draw of the solenoid isn't great enough to cause very much voltage drop. The small battery may affect cranking speed but by then the pinion has already slammed into the ring gear.
 
Many starter do not use a solenoid so the smaller lighter longer cable does in fact help. It all depends on what tractor it is if it helps or not and even then. Say you have a ford 801 the solenoid does not spin out the bendex the starter spinning up does that so again the cable trick will work
 
You ask "Is there a voltage dropping circuit that will still allow a 6 volt starter to function properly on 12 v "

It would have to be an extreme HIGH POWER device as say even if it drew only 200 amps and dropped 6 volts THATS 1200 WATTS !! and such would be huge and impractical.

That being said, a couple cheap reasonable steps one can take to reduce such a hard shock and starter gear engagement when applying 12 volts to a 6 volt starter would be 1) The use of a much smaller CCA rated 12 volt battery and/or 2) Use of smaller then normal battery and ground cables such as 4 gauge or less.

In yearsssssssss as a used tractor dealer and farmer and user I had 6 volt starters on 12 volt converted tractors and NEVER had a problem, although sure, it can be tough on many types of starter drives.

John T
 
I had thought about saying it would take a very big and heavy duty resister to do that but also if you added one if you could find one it would also defeat the reason for going wit h12 volts because it would cause the starter to turn about as slow as it does on 6 volts
 
You will be fine, use smaller 4 gauge cables, use the newer clutch type starter drive if you can.
 
If your starter drive has the half moon counter weight to help it ingage grind it down some to reduce the weight on it to reduce the hard hit on the ring gear.
 
I've used a 12 volt battery on my SC case for 20 years without a problem.
I'm careful not to crank too long but it starts pretty quick so this isn't an issue.
 

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