With twice the voltage across a fixed resistance, you'd have twice the current. Not half the current. And if the starter locks up, that's exactly what you'll get.
Starters, like all DC motors, produce a back-EMF proportional to the speed of the starter. As the starter turns faster, less current flows through the windings than when it is stalled or first starting.
So hooking 12 volts to a 6 volt starter results in double the initial starting current. As the motor spins up, the current through the motor drops. The final current depends on the final RPM of the starter, which depends on the load the engine places on it.
The starter will spin faster with 12 volts than with 6 volts. If it spins twice as fast, current will be approximately THE SAME at 12 volts as it was at 6 volts (because the starter is producing roughly twice as much power). If it spins maybe 50 percent faster (typical), the current will be more than half, but less than the same as it was at 6 volts.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
