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 your ride with confidence — waterproof, rugged, and ready to conquer every adventure!

PLUG PLAY PRECISION - Pre-wired 12 & 16 AWG harness with color-coded labels for hassle-free installation.
BUILT TO BRAVE THE ELEMENTS - Durable nylon 66 housing with IP65 waterproof rating keeps your system safe rain or shine.
STREAMLINED POWER MANAGEMENT - Organize and control up to 6 independent circuits with ease.
UNIVERSAL FIT ANYWHERE MOUNT - Unique 'Z' shaped brackets let you mount securely under any hood or dashboard.
COMPLETE KIT FOR TOTAL CONTROL - Includes 6 Bosch-style 5-pin relays, 10 fuses, terminals, and silicone seals for ultimate convenience.

The True Mods Waterproof 12V Fuse Relay Box Block Kit is a robust, IP65-rated power distribution solution designed for automotive and marine use. Featuring six Bosch-style 5-pin relays rated at 30A/40A, a pre-wired 12 & 16 AWG harness with color-coded labels, and a durable nylon 66 enclosure, this kit simplifies wiring management while ensuring reliable protection for multiple independent circuits. Its universal 'Z' bracket mounting system and comprehensive accessory pack make it the ultimate upgrade for professionals and enthusiasts seeking dependable, weatherproof electrical control.

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
Country of Origin	USA
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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