The KC HiLiTES 3300 is a black, sealed five-pole 12-volt relay rated at 40 amps and sold as a single unit. KC HiLiTES lists the 3300 as standard equipment in its 12-volt light kit applications. Because the manufacturer offers it separately, you can replace a worn or failed relay in a KC harness without buying a complete kit. The sealing guards the contacts against moisture, which matters for a relay mounted in an engine bay exposed to rain, washing, and off-road mud. Buy the genuine KC unit rather than a generic 40-amp relay when you want the replacement to match the harness connector and the rated load your lights were designed around.
Fitment is a matter of wiring rather than vehicle year, make, or model. The manufacturer describes this 5-pin relay as a replacement relay for its harnesses, and it is intended for 12-volt applications only, so it does not suit 24-volt commercial systems. Owners searching for a 5-pole 40 amp relay for auxiliary LED or halogen light bars, spot lights, or a compressor circuit should confirm the pin layout against their existing harness before purchase, because the manufacturer does not sell the matching socket separately.
The manufacturer states that it does not offer the socket on its own. Universal 5-pin relay sockets are available from other sources if you want to rebuild a relay mount.
Yes. The manufacturer specifies that the relay is intended for 12-volt applications only.
Mount the relay close to the battery with its terminals facing downward, as the manufacturer's install sheets for its relay harnesses direct, so moisture does not collect in the terminals. Before you start, remove the in-line fuse and the relay for safety, and reinstall them only after the power and ground connections are complete. Be aware that many vehicles built after 1999 run lighting and accessory circuits through on-board computers, and the manufacturer warns that these may not accept added accessories tied into factory wiring, so check the circuit before you connect. Basic tools such as a crimp tool, sheet-metal screws, and a battery-terminal wrench are typically enough for a swap.
