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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⚡ Power Up Your Ride with Waterproof Precision!

PLUG AND PLAY PRECISION - Pre-wired 12 & 16 AWG harness with color-coded labels makes installation fast and foolproof.
BUILT TO BRAVE THE ELEMENTS - Durable nylon 66 housing with IP65 waterproof rating ensures reliable performance rain or shine.
STREAMLINED POWER MANAGEMENT - Six 5-pin relay sockets and fuse holders keep your circuits organized and easy to control.
COMPLETE KIT FOR TOTAL CONTROL - Includes relays, fuses, terminals, and seals—everything you need to upgrade your vehicle’s electrical system.
UNIVERSAL FIT ULTIMATE FLEXIBILITY - Z-shaped mounting brackets let you install this relay box anywhere under the hood with confidence.

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 relay sockets and fuse holders. It comes pre-wired with 12 & 16 AWG harnesses, color-coded for easy installation, and includes all necessary components for a seamless upgrade to your vehicle, marine, or off-road electrical system.

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Manufacturer	TRUE MODS
Brand	ONLINE LED STORE
Item Weight	2.55 pounds
Product Dimensions	7.88 x 7.13 x 4.25 inches
Manufacturer Part Number	EPSPWR0314
Lift Type	Automatic

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

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