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 12V Automotive Waterproof Fuse Relay Box for 5-Pin Relays

True MODS 12V Automotive Waterproof Fuse Relay Box for 5-Pin Relays

Product ID: 96656267

Details

Connector Type
Solder
Contact Material
Copper
Contact Type
Spdt
Current Rating
10 A 20 A 25 A
Mounting Type
Boat Mount

💧IP65 waterproof rating

🔋12V coil voltage power

🔌6 fused relay sockets

€ 63.18

Duties & taxes included

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power Up Your Ride with Ultimate Reliability!

MOUNT ANYWHERE SECURELY - Innovative 'Z' shaped brackets ensure a rock-solid fit on any vehicle or marine surface.
STREAMLINE YOUR CIRCUITRY - Organize and control up to six independent circuits with integrated fuse holders and relay sockets.
BUILT TO BRAVE THE ELEMENTS - Durable nylon 66 housing with IP65 waterproof protection keeps your system safe rain or shine.
ALL INCLUSIVE INSTALLATION KIT - Comes complete with brackets, seals, and terminals for a hassle-free setup.
CONFIDENCE IN EVERY CONNECTION - Backed by a two-year warranty and top-tier customer support for peace of mind.

The True MODS 12V Automotive Waterproof Fuse Relay Box is a robust, IP65-rated distribution block designed for automotive and marine applications. Featuring six Bosch-style ATC/ATO fuse holders and relay sockets, it offers versatile circuit management in a durable nylon 66 enclosure. Its universal mounting system and complete installation kit make it the go-to solution for professionals seeking reliable, waterproof electrical organization backed by a two-year warranty.

Specifications

ASIN	B07MR64XK1
Best Sellers Rank	#10,994 in Automotive ( See Top 100 in Automotive ) #41 in Automotive Replacement Fuse Holders
Brand Name	ONLINE LED STORE
Coil Voltage	12 volts
Connector Type	Solder
Contact Material	Copper
Contact Type	Spdt
Current Rating	10 A, 20 A, 25 A, 30 A
Customer Reviews	4.6 4.6 out of 5 stars (1,754)
Item Weight	16 ounces
Manufacturer	ONLINE LED STORE
Maximum Switching Voltage	12 volts
Minimum Switching Voltage	12 volts_of_direct_current
Model	PWR0312
Mounting Type	Boat Mount
Operation Mode	Automatic
Part Number	PWR0312
Specification Met	Ip65, Ul
UPC	816165026775
Wattage	480 watts

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