[1970]

1970 Chevelle 307, now a 350...

three wires connect to the starter, the big one from the battery is obvious,

then the other two small wires, one a heavier gauge than the other, and two places on the starter solenoid marked S and R.

Okay, the S is for "start" and I don't know what the R is for,

but which of the wires to go to the S.

Thank you,
Charles

 

[Greg.H]

I'm not sure, so maybe someone else can correct/confirm this, but the "R" wire may be for the resistor wire that goes to the ignition coil. The ignition coil actually runs on 9 volts; there are two wires that are hooked to the "+" side, a 12 volt starter wire, and the 9 volt resistor (cloth covered) wire that your car runs off of while you are driving.

 

[Dean]

IF the car still has points, the small yellow bypass wire that is coming from the coil's + terminal goes on the "R" terminal.

IF the car no longer has points the "R" terminal is not used for anything so that wire needs to be taped off and not connected.

The larger gauge purple wire goes to the "S" terminal.

"R" is for relay, it is hot only during cranking.

 

[woody31]

with the starter bolted on the motor,the 2 smaller wires go to the terminal closest to the block,,oil pan rail,,which should be S for solenoid. good luck ,,,cheers

 

[Coppertop]

You don't want to just combine two wires on the same terminal.

It would indeed be helpful if we knew what ignition system the poster was running.

"S" terminal closest to the block connects to the purple wire which comes from the neutral safety switch or clutch pedal safety switch depending on the type of transmission.

"R" terminal connects to the yellow wire which leads up to the ignition coil (+) terminal for points ignition.

"B" terminal is obvious indeed, largest stud, connects to battery (+) cable.