Adding a resistor to 12V starter motor

ben harpo · Mar 26, 2018

I have a TO30 with the 12V conversion kit. I'm replacing the starter motor. After having blown the previous one.

A friend of mine said that old vehicles typically need a resistor between the battery and the starter. Does anyone else put a an extra resistor there?

David G · Mar 26, 2018

use a smaller diameter battery cable, that will work the best.

pomester · Mar 26, 2018

if you are replacing the starting motor, replace it with a 12v unit, problem solved -

old · Mar 26, 2018

No way to buy a resister that has a large enough amp rating to handle the amp draw of a starter. Most of my tractors are 12 volt with 6 volt starters on them and I have yet to burn up a starter. The key to not harming the starter is to only spin the engine over for short periods of time do not sit and crank it for minutes at a time or yes you will let the smoke out of a starter be it 6 or 12 volts.

rvirgil_KS · Mar 26, 2018

No. On a 6 to 12 volt conversion a resistor is often added between ignition switch and 6 volt coil, but not to starter circuit

Many 6 volt starters have been used successfully with 12 volts.

Starter will rotate same direction regardless if positive or negative ground.

John Deere D · Mar 26, 2018

Starter, 12 Volt - This new 12 volt starter with drive is for tractor models TO20, TO30, 35, 50, 65, 202, 204, 302, 356, TO35. Verify number off old starter. Replaces the Delco number 1107226 and the original equipment numbers: 181541M91, 1109457, 182454M92, 1107654, 190004M91, 1107226 and TISCO starters 7877-EX, 81271-EX, 85451-EX, 4858MFGXL_12V, and 1900348M91. (Part No: 1107226)

Ian Beale · Apr 1, 2018

We have a 1954 flathead Ford truck that was converted to 12 volt. It is a Lucas system.

My friendly auto elec put 12 volt field coils in the 6 volt starter to tame it down some.

Adding a resistor to 12V starter motor

ben harpo

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David G

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pomester

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old

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rvirgil_KS

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John Deere D

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Ian Beale

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