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John T
08-24-2000 14:06:14
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Re: Jumping a 6 volt starter in reply to AS, 08-24-2000 10:57:15
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AS, this can and is done often but be careful. OK if the tractor is still positive ground as it was new, yes the positive goes to frame and the negative to the starter. Starter would still run same direction though, even if reversed, but you want to keep the polarities of all else the same anyway. (I am assuming you still have a 6 volt + gnd system and battery) Now I gotta suggest you totally disconnect the big cable from the 6 volt battery to the starter and jump 12 volts direct to the starter ONLY (pos to frame, neg to starter). I say this because if you connect your 12 volt jumpers to frame and the starter with that big cable still attached, your applying 12 volts to your 6 volt battery and that can cause a battery blow up !!!!! I have seen it done and also witnessed some batterys blow their lids literally and acid flying around. Now, theres another potential problem however. On many tractors, its at that starter post where a smaller like 10 or so feed wire goes to the ignition switches and other loads. Therefore, if your tractor has that and you disconnect the exisitng big battery lead and not that small one, youre going to be putting 12 volts on the entire system. To cure that if thats what you have, just temporarily conect that smaller feed wire over to the big battery cable thats now off the starter, and the 6 volts will be present at all other tractor 6 volt loads. Then jump the starter with 12 volts direct and she should run fine becasue all else is powereed from the 6 volt battery as normal. If your main power feed is off the battery or elswehere, this last part isnt a problem. Now I know some may say aw just jump it at the starter and she will run, but as an engineer and attorney I gotta make these disclaimers, I just cant help myself. The reason it may have got hot is because those direct jump starts always produce heat anyway because of an actual lousy connection you are making. (Short answer): So keep polarities of batteries the same always regardless of which battery lead happens to be connected to the tractors steel frame. Ol John T Engineer and Attroney
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