Re: Measuring electricity

Posted by mkirsch on February 22, 2011 at 05:45:08 from (64.80.110.75):

In Reply to: Measuring electricity posted by JTKY on February 21, 2011 at 15:13:47:

Well, my experience with so-called "testing" and "repair" of starters is that most don't really know what they're doing. If they apply battery power to the starter and it spins, it's "good."

There may be nothing wrong with the starter, too. Is this a 12V conversion?

A battery's voltage drops when you put a heavy load on it. While cranking, the battery could drop from 12V down to 8V. Since the ballast resistor cuts that voltage roughly in half, the coil only sees 4V, which isn't enough to get it to fire.

We've got a Super M with a TSC "high torque" starter in it (from back in the day when TSC was a tractor parts dealer, not a horse feed store). After converting it to 12V, the tractor won't start until you let off the starter. Not a big deal because the starter spins the living daylights out of the engine.

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