How do you hook up a starter relay?
Wiring a relay is straightforward.
- Mount the starter relay.
- Connect the starter motor lead to the switched output.
- Connect the smaller terminal or terminal post marked SIGNAL, SWITCH or IGN to the ignition switch.
- Connect the battery positive terminal to the other large terminal last, which may be marked BATTERY or BAT.
What wires go to the starter solenoid?
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).
Do I need a relay for starter solenoid?
It allows a large current to flow when you turn the ignition key or press the start button on your car. The ignition switch cannot handle the large current required by the starter motor. Without the relay, it would burn out.
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 connect to 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 three wires on a starter solenoid?
Typically, a starter-mounted solenoid has three terminals with three connections: The “B” or “battery” terminal: The terminal that connects the solenoid directly to the positive battery cable. The “S” or “start” terminal: The terminal that receives power from the ignition switch.
When would you use a starter relay?
Between the vehicle’s battery and the starter motor, a starter relay serves as an electrical circuit completer or circuit breaker. It assists in increasing the battery’s current so that less current is required upon ignition.