How do the unused relay/fuse sockets stay waterproof? I only need 3 relays right now but want room for more.

All the seals for the bottom come without any holes, so there is no need to wire the terminals with short pigtails like another answer suggested. You need to actually poke a hole in them to wire it. The holes are already most of the way through, with just a little skin left at the bottom so it's sealed untill you need it. I just pushed a little dowl through the holes I wanted open for wire.

Can i use the fuses in the panel for the same circuit as the relays?

Yes. I used the fuses for the load side of the relays.

Does the kit with harness come pre wired?

Mine did not, but it came with all the clips and everything To go on the wires and then click into it. I used it for my UTV.. It is very nice. The one in the picture that you asking me about. Looks like it is pre-wired and numbered for each Relay.

Can I use one of these as a horn relay, grounding one coil through the steering column with three others supplied current from switches as usual?

A relay is nothing more than a switch with a normally open and a normally closed contact. Yes you can use a relay to energize your horn. The button in the steering column switches ground when you push it. Connect the ground potential coming from the closed horn switch to the relay on terminal 86, connect a constant 30 amp potential12V source to both 85 & 30 and connect 87 to the positive side of the horn. The horn must be grounded to function. When you push the horn button the circuit to the relay coil will close, switching it to energize the horn.

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True Mods Waterproof 12V Fuse Relay Box Block Kit w/Pre-Wired Harness [12 & 16AWG] 6 Gang Bosch Style 5Pin 30A/40A Universal Relay & Fuse Panel for DC Auto Automotive Vehicle Car Marine Boat Jeep UTV

True Mods Waterproof 12V Fuse Relay Box Block Kit w/Pre-Wired Harness [12 & 16AWG] 6 Gang Bosch Style 5Pin 30A/40A Universal Relay & Fuse Panel for DC Auto Automotive Vehicle Car Marine Boat Jeep UTV

Product ID: 561224725

Details

Connector Type
Solder
Contact Material
Silver
Contact Type
Normally
Current Rating
40 Amps
Mounting Type
Panel Mount

⚡40A max current per relay

💧IP65 waterproof rating

🔋12V automotive power

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R5658

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Description

⚡ Power your adventure with confidence—wired for the wild!

EFFORTLESS INSTALLATION - Pre-wired 12 & 16 AWG harness with color-coded labels for quick, error-free setup.
BUILT TO BRAVE THE ELEMENTS - Durable nylon 66 housing with IP65 waterproof rating ensures reliable performance in any weather.
STREAMLINED POWER MANAGEMENT - Consolidate and control up to 6 independent circuits with Bosch-style 5-pin relays and fuse holders.
UNIVERSAL FIT ANYWHERE MOUNT - Unique 'Z' shaped brackets allow secure mounting under the hood or on any vehicle type.
COMPLETE KIT FOR ULTIMATE CONVENIENCE - Includes 6 relays, 10 assorted fuses, terminals, connectors, and silicone seals—everything you need in one box.

The True Mods Waterproof 12V Fuse Relay Box Block Kit is a rugged, IP65-rated power distribution solution designed for automotive and marine use. Featuring six Bosch-style 5-pin relay sockets with 30A/40A relays, a pre-wired 12 & 16 AWG harness, and a durable nylon 66 enclosure, it organizes and protects multiple circuits with ease. Its universal mounting brackets and complete accessory kit make installation fast and reliable, perfect for professionals and enthusiasts who demand dependable electrical performance in any terrain.

Specifications

ASIN	B0CDZCKBWM
Best Sellers Rank	#1,141,274 in Electronics ( See Top 100 in Electronics ) #324 in Car & Vehicle Fuse Holders
Brand	ONLINE LED STORE
Brand Name	ONLINE LED STORE
Coil Voltage	12 Volts
Connector Type	Solder
Contact Current Rating	40 Amps
Contact Material	Silver
Contact Type	Normally Closed
Current Rating	40 Amps
Customer Reviews	4.6 out of 5 stars 1,535 Reviews
Manufacturer	TRUE MODS
Maximum Switching Current	10 Amps
Maximum Switching Voltage	12 Volts
Minimum Switching Voltage	12 Volts
Mounting Type	Panel Mount
Operation Mode	Automatic
Part Number	EPSPWR0314
Specification Met	IEC/EN 60947
UPC	810097591295
Upper Temperature Rating	85 Degrees Celsius
Wattage	144 Watts

Reviews

S**O

Buen producto y de calidad

Muy bueno, de buen material y me llegó antes de lo previsto

2.07.2022

A**C

Working perfectly

29.11.2025

J**R

Would buy again

31.01.2026

J**E

1967 f100 relay upgrade

16.06.2023

J**I

Good product

30.01.2026

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R5658

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