A typical starter solenoid has one small connector for the starter control wire (the white connector in the photo) and two large terminals: one for the positive battery cable and the other for the thick wire that powers the starter motor itself (see the diagram below).

Consequently, what is the R and S on a starter?

The “R” terminal is hooked up to a yellow wire which leads to the coil, which supplies additional battery voltage to the coil ONLY WHEN THE STARTER IS TURNING. The S on the solenoid stands for START which is what the purple wire is forit activates the solenoid when you turn the ignition switch to the start position.

One may also ask, does the positive battery cable connect to the starter? Battery cables The negative (ground) cable connects the negative “-” battery terminal to the engine cylinder block, or transmission, close to the starter. The positive cable connects the positive “+” battery terminal to the starter solenoid.

Considering this, what happens if you hook up a starter backwards?

Most starters change both fields when reversing the wires causing the motor to spin ALWAYS in the same direction. Once you connect the positive wire from the battery to the negative of the starter which is difficult to do – You make a short circuit and better hope it ends well since there is a large current involved.

What wire goes where on a starter?

Placement of a Battery Cable on the Starter The short answer is that the red cable connector clamps to the positive terminal, and the black cable clamps to the negative terminal. This will be true whether you're replacing the battery or the starter.

Related Question Answers

Does it matter which way a solenoid is wired?

So your probably safe. The wires going to the motor do matter. if wrong motor will turn backwards. There are two sets of terminals, a smaller set to activate the solenoid, and a heavier set for the motor.

How do you hook up a starter solenoid wire?

Run a section of 18-gauge wire from the “B” terminal on the solenoid to the “S” terminal on the starter motor. Strip 1/4 inch of wire from the end of the wire using the wire strippers and then crimp a blue ring terminal on each end. Then connect the wiring to the terminals using the open-end wrench set.

What is the small wire to the starter?

the small wire is the solenoid wire. when you turn the key thats what sends the power to enguage the starter gear. take that wire off and have a friend turn the key forward while you use a test light to see if you are getting power to it. there should only be power to it when the key is all the way forward.

Does a starter have a ground wire?

It should be grounded through the flywheel housing and the mounting bolts. The motor Is grounded and runs if the car is push started. If starter has a ground then the only other thing this leads to be the wire between the solenoid and the starter.

How do you bypass a starter solenoid?

How to Bypass the Starter Solenoid
  1. Locate the starter motor under the vehicle.
  2. Locate the two metal contacts on the back of the starter solenoid.
  3. Place the metal blade of an insulated screwdriver across both metal contacts.
  4. Get a friend to help you by turning on the ignition with the key.
  5. Listen to the starter motor.

How do you know if your starter solenoid is bad?

Have a friend turn the key in the ignition to attempt to start the vehicle. Listen carefully, as you should hear a click when the starter solenoid engages. If you do not hear a click, the starter solenoid is likely not functioning properly. If you do hear clicking, the solenoid may be engaging, but not sufficiently.

What does the S and I stand for on a starter solenoid?

Never posted here before but registered to add my two cents in case anyone is looking for the correct answer. S stands for “start”, not starter. I stands for “ignition”. As explained above when trying to start the car power is put to the s terminal and the solenoid is energized.

What is wrong when you turn the key and nothing happens?

If nothing happens when you turn the ignition key to the “Start” position, it means that the starter motor doesn't turn over the engine. Most commonly this could be caused by a dead battery; here is How to check the battery. The starter solenoid control wire could have a bad connection.

How do you wire a starter relay?

Wiring a relay is straightforward.
  1. Mount the starter relay.
  2. Connect the starter motor lead to the switched output.
  3. Connect the smaller terminal or terminal post marked SIGNAL, SWITCH or IGN to the ignition switch.
  4. Connect the battery positive terminal to the other large terminal last, which may be marked BATTERY or BAT.

What can cause starter failure?


Electrical connections faulty. Solenoid switch (engaging relay) stiff or faulty. Electric motor damaged electrically. Single-pinion gear, starter pinion or freewheel damaged.

What are the terminals on a starter solenoid?

Starter Solenoid

The solenoid has 3 terminals; a B+ terminal, an S terminal and an M terminal. The B+ terminal is connected directly to battery positive at all times. This wire is unfused meaning that if there is a short to ground on this wire, there will be sparks until the battery is drained.

What do the letters mean on the back of an ignition switch?

The letters on the back of an ignition switch stand for the following: M = Magneto. S = Starter Solenoid. L = Lights. A = Accessory.