Projects GM starter question

On the solenoid there is an R and S pole. I'm trying to hook-up a simple on/off switch and a starter button. With the switch on I can start the car, flip the switch to off and it doesn't kill the motor???? Please someone make a suggestion, thanks.

 

The S is the start switch(momentary) R to the + coil only used for points (momentary) ...coil pos+ keyed on or off

 

Well , on the starter the S term cranks the engine when you apply 12v. The R term is hot (12V) when you crank the engine...The R term is the ballast (R)esistor by pass. this is a holdover from the points ign days....when you remove the power from the S term the R term no longer has 12v...
All you need to simple wire is a 12v source, a push button starter switch and a toggle switch.. take 12v from the batt, power the push button and toggle switch.. push button to S term on starter, toggle to + side of the coil.
Dave

 

If I understand this post correctly, you are trying to shut the engine off by breaking the circuit at the starter. Not going to happen. The "S" terminal is only used to actuate the solenoid to engage the starter motor. The "R" terminal was used at one time to supply battery voltage to the ignition coil on point style ignitions. That terminal use was pretty much negated by the movement to electronic ignition systems since the 70's.

The only way you can interrupt the engine is to break the circuit on either side of the coil on a breaker point style ignition, or the power source circuit leading into the electronic ignition system is so equipped.

 

Have you tried starting it with the push button without turning on the on off switch? You may be getting voltage to the coil from an unknown source. If it wont start with the switch off then your alternator may be back feeding voltage to the coil after the motor is running. What kind of alternator are you running and how is it wired?

 

Thanks, I will re-check my wiring.

 

I think I have a bad started starter solenoid.

 

Steamer, you need to post a few more details. With what is posted now it sounds like your solenoid is fine. It is more likely as suggested that you have voltage feeding back from the alternator or other source to the input of your ignition coil and back feeding it. Are you running points, are you running an alternator or generator? A diode in the mix will probably cure your problem.