David:
Older starters use battery current to excite the field windings;
When you reverse the polarity, the current through the field windings
also reverses, so in effect you get two reversals which cancel each
other and the starter spins in the same direction.
The new permanent magnet "Mini-starters" will not do this, and
so they will spin in the wrong direction.
Vance
-----Original Message-----
From: owner-spridgets@autox.team.net
[mailto:owner-spridgets@autox.team.net] On Behalf Of SDOliner@aol.com
Sent: April 06, 2006 5:37 PM
To: spridgets@autox.team.net
Subject: Re: starter and ground
For reasons that I can't explain, the starter motor spins the same
direction
despite the polarity. I had read this, but really didn't believe it
until I
switched from positive to negative ground on my TR4A. Swapped a few
wires and
followed directions to energize the generator coil, cranked the engine
and
it fired. Life should be so easy.
David Oliner
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