Re: Bosch starter problems... suggestions?

Posted by Bill in NC on December 28, 2004 at 14:25:55 from (70.60.104.251):

In Reply to: Bosch starter problems... suggestions? posted by fixitforfree on December 27, 2004 at 20:10:08:

I agree with all the previous posts (large
cables, eliminate corrosion at connections)
and mention another possibility. The winding
in electric motors can develop subtle "shorts"
over time, particularly when the electric motors
have been run on a heavy load for an extended
period. The insulation on the windings
degrades and, instead of the effective winding
length being, say, 100 feet, the winding
touches wire-to-wire through breaks in the
winding wire insulation (lacquer) in a couple
of places and suddenly the effective winding
length is only 50 feet. Cutting the winding
length in half significantly reduces the
electromagnetic field potential resulting in
less power and slower output rpm. The
problem gets progressively worse as the
starter tries to make up the field potential loss
by sucking in higher amperage which in turn
creates higher winding temperatures, which
subsequently degrades the winding
insulation, which then results in more
wire-to-wire contact points, which further
shortens the effective winding length. If you
have the problem after putting new cables and
eliminating corrosion, then the next step
would be a new starter or having the starter
motor rewound.

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