ONLINE LED STORE Bosch-style 5-Pin 12V Waterproof Relays 5-Pack — SPDT 30/40A with 12AWG Heavy-Duty Leads

The True MODS 5-pack Bosch-style 5-pin relays are waterproof 12V SPDT switching units designed to handle heavy automotive and marine electrical loads with rugged 12AWG main wiring.

This relay kit from ONLINE LED STORE combines weatherproof housings, Bosch-style socket compatibility, and clear wire color coding so you can control accessories, lights, and motors without rewiring existing harnesses. Each relay is rated for 12VDC operation (up to 14V) and built to tolerate high currents, making them suitable where reliable switching and corrosion resistance matter. The set includes five identical relays so you can outfit multiple circuits or keep spares on hand.

How does this relay handle heavy electrical loads?

These relays are built with a robust contact design and heavier gauge wires for the primary current path, giving them the capacity to switch higher-amp accessories safely. They separate the low-current trigger circuit from the high-current output so the control switch carries minimal load.

• Rated switching capacity: 40A for the main contact, 30A for alternate contact.
• 12AWG wires on the main contact reduce voltage drop and heat buildup.
• Bosch-style contact layout supports common automotive wiring standards.

Are these relays weatherproof and suitable for outdoor use?

Yes — each relay features a sealed housing that protects internal components from moisture, dust, and debris, making them appropriate for under-hood, trailer, and marine installations. The durable casing plus quality terminals help resist corrosion in wet or dirty environments.

• Waterproof enclosure protects the coil and contacts from exposure.
• Heat-resistant materials tolerate engine-bay temperatures and road vibration.
• Designed to work reliably in damp, dusty, or salt-exposed locations.

Which wires do I connect for trigger, power, ground, and outputs?

The relay uses standard Bosch-style pin assignments and color-coded leads to simplify wiring. Following the wire colors helps avoid mistakes when integrating with existing harnesses or relays.

• Black = ground (pin 85) for coil return.
• Red = battery positive/input (pin 30) for the common contact.
• White = trigger/coil positive (pin 86) to energize the relay.
• Yellow = normally closed output (pin 87a) when coil is not energized.
• Blue = normally open output (pin 87) that closes when coil energizes.

How do these relays fit into existing vehicle or accessory systems?

They plug into standard Bosch-style sockets or can be panel-mounted with compatible holders, allowing quick upgrades without redesigning wiring. Use them to control LED bars, horns, pumps, fans, winches, or any accessory where isolating the switch from high current is preferred.

• Fits Bosch-style 5-pin relay sockets and common relay blocks.
• Ideal for adding switched power circuits to lighting and motors.
• Use the five-relay pack for multi-circuit projects or backups.

Who is this for: Technicians, DIY vehicle modifiers, marine electricians, and fleet maintenance teams who need dependable, sealed relays for medium- to high-current circuits will appreciate this True MODS 5-pack. It’s well-suited for anyone upgrading headlamps, auxiliary lighting, winches, pumps, or aftermarket electronics where waterproofing, clear wiring, and Bosch-style compatibility matter. If you want a compact, plug-and-play relay solution that minimizes wiring changes while improving durability, this kit provides five ready-to-install units with clear lead identification and heavy-duty conductors for safer switching.