ONLINE LED STORE True MODS 6-Pack Bosch-style 4-Pin 12V Fused Relay Kit — 30A, 14AWG Prewired Harnesses

The True MODS 6-Pack Bosch-style 4-pin fused relay kit is a ready-to-install set of 12V SPST relays with integrated fuse sockets and heavy-gauge wiring for reliable 30A switching.

This kit from ONLINE LED STORE bundles six Bosch-style 4-pin single-pole single-throw (SPST) relays, matching harnesses and blade fuses so you can quickly add high-current switching to automotive, marine, or off-grid projects. Each harness includes a built-in fuse holder populated with a 30A blade fuse and heavy-duty 14 AWG main conductors for durable power delivery. The relays are rated for 12VDC operation (safe to 14V max) and engineered to handle up to 30 amps on the switched output.

How do these relays simplify wiring high-current accessories?

Using a relay shifts the heavy current flow away from switches and thin wiring, protecting controls while delivering clean power to accessories. The included harnesses have clearly colored leads and an integrated fuse socket so you can mount the relay close to the load or battery for safer runs.

• Built-in 30A blade fuse protects the circuit at the relay location.
• Heavy 14AWG wires for main contact reduce voltage drop and heat.
• Plug-and-play Bosch-style socket makes swapping or replacing relays fast.
• Color-coded leads: Black ground, Red power, White trigger, Blue switched output.

What wiring configuration and terminals are included?

Each relay in the set follows the Bosch 4-pin SPST layout for simple control: two coil pins and two contact pins. The harnesses match those pins so you won’t need to splice terminals or cross-reference charts during installation.

• Pin 85 — ground (black lead) for coil return.
• Pin 86 — trigger (white lead) to activate the coil.
• Pin 30 — supply/main VDC (red lead) with 14AWG conductor.
• Pin 87 — normally open output (blue lead) to the accessory.

Can these relays handle my accessory’s power needs?

Each relay is specified for 30 amps of switching capacity, suitable for many lights, motors, pumps, and aftermarket accessories found in vehicles and boats. For continuous high-draw loads or grouped circuits, plan wiring and fuse sizing accordingly and consider paralleling circuits only when proper design guidelines are followed.

• 30A switched capacity with included 30A blade fuse in each harness.
• 12V nominal rating, tolerant up to 14V peak system voltage.
• 14AWG main conductors minimize voltage drop on typical accessory runs.
• Six relays and six harnesses for multi-accessory installations or spares.

How does the kit save time during installation and maintenance?

The prewired harnesses and included fuses remove repetitive prep work and standardize wiring across installations, reducing error and service time. The Bosch-style socket design allows quick relay replacement without rewiring if a relay fails or you upgrade components.

• Pre-assembled harnesses eliminate crimping and soldering on-site.
• Included blade fuses let you test circuits immediately after mounting.
• Modular relays are simple to replace or swap during troubleshooting.
• Six-pack provides spares for future add-ons or repairs.

Who this is for: This True MODS relay kit is ideal for DIY mechanics, electricians, installers and hobbyists who add lighting, winches, pumps, stereo amplifiers or other 12V accessories to vehicles, boats, ATVs, or custom electrical projects. It’s designed for anyone who wants a clean, protected, and easy-to-service relay solution without fabricating harnesses from scratch.