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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Description

⚡ Power Up Your Ride, Rain or Shine!

PLUG PLAY POWER - Pre-wired 12 & 16 AWG harness with color-coded labels for a hassle-free, professional installation.
COMPLETE KIT CONVENIENCE - Includes 6 relays, 10 assorted fuses, terminals, and silicone seals—everything you need in one box.
ULTIMATE CIRCUIT CONTROL - Manage up to 6 independent circuits with ease using Bosch-style 5-pin relays and fuse holders.
BUILT TO BRAVE THE ELEMENTS - IP65-rated nylon 66 housing ensures your wiring stays dry and durable in any weather.
UNIVERSAL MOUNTING FLEXIBILITY - Unique 'Z' shaped brackets let you mount securely anywhere under the hood or on your rig.

The True Mods Waterproof 12V Fuse Relay Box Block Kit is a rugged, IP65-rated automotive power distribution solution featuring six Bosch-style 5-pin relays and fuse holders. With a pre-wired 12 & 16 AWG harness and universal mounting brackets, it offers professional-grade circuit management for cars, boats, UTVs, and more—ensuring reliable, organized, and waterproof electrical control on any adventure.

Specifications

Connector Type	Solder
Contact Material	Silver
Contact Type	Normally Closed
Current Rating	40 Amps
Mounting Type	Panel Mount
Brand	ONLINE LED STORE
Operation Mode	Automatic
Wattage	144 Watts
Coil Voltage	12 Volts
Contact Current Rating	10 Amps
Maximum Switching Current	10 Amps
Maximum Switching Voltage	12 Volts
Minimum Switching Voltage	12 Volts
Specification Met	IEC/EN 60947
Upper Temperature Rating	85 Degrees Celsius
UPC	810097591295
Manufacturer	TRUE MODS
Number of Memory Sticks	1
Item Weight	1 kg 180 g
Product Dimensions	20.02 x 18.11 x 10.8 cm; 1.17 kg
Item part number	EPSPWR0314
Item Height	4.25 Inches
Item Width	7.13 Inches
Are batteries included?	No

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