You need to take one apart. Electronics I'm no guru. Automotive
electrical systems from 1940-1980 I've got down.
The standard starter solenoid used in a majority of automobiles is
similar to the one produced by AC-Delco. The basic terminal connections
are: 12v high amperage in, 12v high amperage out, 12v switch current in.
When the power is applied to the 12v switch current in terminal, it
energizes the coil, pulling a cylinder into the coil against spring
pressure. As the cylinder reaches the end of its travel it depresses a
'button' which moves a copper disk, against spring pressure again, to
connect the 12v high amperage terminals together. This applies voltage
to the starter motor windings. Additionally, the cylinder is connected
mechanically to a fork that moves the starter drive into engagement with
the flywheel.
AFAIK, the typical Delco solenoid is only one winding.
How do I know all this? When you're broke, you can open up the
solenoid, rotate the big copper disk 90 deg., put it back together and
not have to spend the $12 for a new one...
Jim
"Dwight K. Elvey" wrote:
>
> Hi
> I have never seen this on a solenoid type of starter relay.
> The switches on the solenoid were always for the ignition
> resistor bypass and the main switch for the starter motor.
> The only time I've seen this is on the Ford type starter where
> the pull in for the gear comes from a pole piece in the started
> motor. The pole piece would pull in and change the field to be
> series with the motor armature. There was a separate solenoid
> that powered this and it always had the full coil current and
> only switched the current to the starter and the ignition
> resistor bypass.
> Pinball machines do have what is called a EOS ( end of stroke )
> switch that is used on flippers to reduce the current for holding.
> Dwight
Received on Wed Jun 12 2002 - 19:11:01 BST
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