Starter switch

CNKS

Well-known Member
I ordered a Super A starter switch as by the parts book number from the local CaseIH dealer. He said he couldn't find the number, changed from the old number or not. The SA is 6 volt. I received a off brand 12 volt switch. I assume the thing will work as long as I don't turn it over for long periods. I don't because I keep it on a battery maintainer and it starts in a few seconds. Voltage may have no effect? Am I correct? Cost $8.80, lowest price I have ever spent there.
 
A switch does not care if it is 6 volts or for that matter 24 volts. Now amps on the other hand can be a problem. Just like with battery cable as you know a 2 gauge battery cable does not work well with 6 volts but does just fine with 12 volts. So yes you should get by just fine and I bet if you compare the 2 you will not find much if any difference in the 2
 
First off, the voltage withstand (sort of like insulation strength) rating of EITHER starter switch is wayyyyyyyyyyyyy higher then 6 or 12 or even 24 volts. Therefore, its really the CURRENT RATING THATS CRITICAL and so long as its within the specs of the current the starter will draw, IT WILL MOST LIKELY BE FINE.

NOTE many 6 volt starters indeed draw MORE current then a 12 volt starter which is why they use bigger cables on 6 volt tractors in order to reduce critical voltage drop across the cables themselves. You want and need all the available energy to be dissipated in the starter NOT as I Squared R heat energy loss in the cables.

Its when the switch closes or opens that a lot of heat and arcing and burning and carbon can develop. Once its closed and conducting current free of arcing and burning and pitting the contactors, you're causing less switch contact degradation.

John T
 
Thanks, that's what I thought. I have no problem with 2 gauge and 6 volts, as long as the connections are clean--on 4 tractors.
 
Again 2 gauge is ok if they are short cables bad there longer they are to more amp loss is there and then heat and then break downs due to amp loss and burnt cables
 
2 Gauge can get you by (even bigger cable has less voltage drop), it depends on the starters current draw and length of the cables. Actually its VOLTS that get dropped "across" the cable not Amps (V = I x R). The more current and the more distance and the smaller the wire THE GREATER THE VOLTAGE DROP. For improved starter performance its best to discharge the energy in the starter NOT as I Squared R wasted heat loss energy in the cables.

Best wishes

John T
 

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