Relays

Relays: the switch that lets a small signal run a big load

A relay is an electrically operated switch. A low-current signal from your ignition, ECU or a dash button energizes a coil inside the relay, and that coil closes a set of contacts that carry the real load - starter current, fuel pump feed, fan power, nitrous solenoids. You fit one so a thin trigger wire and a small switch never have to carry heavy amperage. Wiring a fuel pump or a starter straight through a switch cooks the switch and the wire; run it through a relay and the switch only handles the trigger. That is why relays show up on nearly every rewire and accessory install.

What we stock in relays

There are 12 relays in this category, from 6 brands: Hella, QuadBoss, TwinPower, Nitrous Express, Haltech and Bosch. Hella accounts for six of the twelve, so the bulk of the range is general 12V main-current and switching relays, with a smaller spread of purpose-built units. Prices currently run from $21 to $81 - that is the live range for what is in stock, not a fixed price.

Concrete examples across that spread: the Haltech Solid State Relay 100 AMP sits near the top at $80.72, the Hella 12V 20/20 Amp Main Current Relay at $65.12, and the Nitrous Express 40 Amp Heavy Duty Relay with wire harness at $59.68. For a starter-side replacement there is the Twin Power Starter Relay at $50.71.

How to choose a relay

Start with the current rating and match it to the load. A 20-amp switching relay is fine for lights or a light accessory; a fuel pump, fan or starter feed wants more headroom. The mechanical Hella and Bosch style relays are the common, inexpensive workhorses. A solid-state unit like the Haltech has no moving contacts to wear, which is why it carries a higher price. If you are wiring nitrous, the Nitrous Express relay ships with its own harness, which saves you sourcing connectors. And some relays are vehicle-specific rather than universal - the QuadBoss Polaris General 1000 Turf Mode Relay and the QuadBoss Polaris ACE 150 Relay replace a named function on a named machine, so buy those to the application, not to an amp figure.

Fitment

Two of these relays carry model fitment data, both Polaris: the Polaris General 1000 and Polaris ACE 150, across model years 2017 to 2021. The rest are rated by voltage and current rather than by vehicle, so you match them by spec. If you are unsure which relay your circuit needs, call fitment help at 813-535-5801 before ordering.

What else you need with it

A relay is one piece of a circuit. If you are feeding a fuel pump, pair it with the right pump from Fuel Pumps. Cranking issues often trace back to power supply, so check Batteries too. For the connectors and joins around the install, see Adapters and Fittings. Browse the full Engine Components section for everything else.

Ordering

All orders ship free, and Affirm and Katapult financing is available at checkout. Still not sure what your build needs? Reach us through contact us or by phone.

Relays: the switch that lets a small signal run a big load

A relay is an electrically operated switch. A low-current signal from your ignition, ECU or a dash button energizes a coil inside the relay, and that coil closes a set of contacts that carry the real load - starter current, fuel pump feed, fan power, nitrous solenoids. You fit one so a thin trigger wire and a small switch never have to carry heavy amperage. Wiring a fuel pump or a starter straight through a switch cooks the switch and the wire; run it through a relay and the switch only handles the trigger. That is why relays show up on nearly every rewire and accessory install.

What we stock in relays

There are 12 relays in this category, from 6 brands: Hella, QuadBoss, TwinPower, Nitrous Express, Haltech and Bosch. Hella accounts for six of the twelve, so the bulk of the range is general 12V main-current and switching relays, with a smaller spread of purpose-built units. Prices currently run from $21 to $81 - that is the live range for what is in stock, not a fixed price.

Concrete examples across that spread: the Haltech Solid State Relay 100 AMP sits near the top at $80.72, the Hella 12V 20/20 Amp Main Current Relay at $65.12, and the Nitrous Express 40 Amp Heavy Duty Relay with wire harness at $59.68. For a starter-side replacement there is the Twin Power Starter Relay at $50.71.

How to choose a relay

Start with the current rating and match it to the load. A 20-amp switching relay is fine for lights or a light accessory; a fuel pump, fan or starter feed wants more headroom. The mechanical Hella and Bosch style relays are the common, inexpensive workhorses. A solid-state unit like the Haltech has no moving contacts to wear, which is why it carries a higher price. If you are wiring nitrous, the Nitrous Express relay ships with its own harness, which saves you sourcing connectors. And some relays are vehicle-specific rather than universal - the QuadBoss Polaris General 1000 Turf Mode Relay and the QuadBoss Polaris ACE 150 Relay replace a named function on a named machine, so buy those to the application, not to an amp figure.

Fitment

Two of these relays carry model fitment data, both Polaris: the Polaris General 1000 and Polaris ACE 150, across model years 2017 to 2021. The rest are rated by voltage and current rather than by vehicle, so you match them by spec. If you are unsure which relay your circuit needs, call fitment help at 813-535-5801 before ordering.

What else you need with it

A relay is one piece of a circuit. If you are feeding a fuel pump, pair it with the right pump from Fuel Pumps. Cranking issues often trace back to power supply, so check Batteries too. For the connectors and joins around the install, see Adapters and Fittings. Browse the full Engine Components section for everything else.

Ordering

All orders ship free, and Affirm and Katapult financing is available at checkout. Still not sure what your build needs? Reach us through contact us or by phone.