12 Jun
2002
12 Jun
'02
7:11 p.m.
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