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How do you wire a starter relay?

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 wires go to a starter motor?

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.

What does the starter relay connect to?

These terminals connect to the ignition switch to supply current to the coil when the ignition key is turned to “start”. The other big posts are the starter circuit terminals. One connects to the battery and the other to the starter.

Does a starter relay need to be grounded?

The relay must be on the ground side of the load when the voltages above the coil are hot. The case should be grounded. The relay can be on either side of the load for hot switch voltages that are lower than the coil.

How many wires should be on a starter?

To start and run a vintage car, you need only four wires—three for the starter and one for the coil. To recap: Thick, red wire from battery positive to threaded post on the starter motor. It can be a jumper cable, but if you need to move the car, a secured battery cable is much better.

What are the terminals on a starter solenoid?

Find these two metal terminals on the starter solenoid: A small one that connects a wire to the ignition switch (terminal S) A large one that connects the solenoid to the starter motor (terminal M)

Does a relay need to be mounted to metal?

The relay may only have one pin for the coil if it’s in a metal housing. The housing must be mounted directly to the ground. The relay will have 2 pins for the coil if it’s in a plastic housing.