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The Wires Don't Lie — Here's What Each One Does
The sealed relay runs four wires. Each color is a job. Know the job, know the install.
RED — Fused Positive Power Source This is your heavy wire. Runs from the battery positive through a fuse directly to the relay. This is the high-current side — size your wire gauge to your load, not what feels right. Fuse lives here, on the battery side. Not between the relay and the load.
BLACK — Trigger / Switch Positive This is your signal wire. Thin gauge. Runs from your switch to the relay coil. When you flip the switch, 12V hits the coil, the relay energizes, the contact closes. Your switch never sees the load current — just milliamps. This is why switches don't burn out when you wire it right.
BLUE — Output to Load Power out to whatever you're running. Winch. Compressor. Lights. Locker. This wire only carries current when the relay is energized. When the switch is off, this wire is dead. That's intentional — no parasitic drain, no phantom load.
WHITE — Ground Ground for the coil side of the relay. Run this to the same chassis ground point as your load. Shared ground reference eliminates phantom voltage and the weird intermittent behavior that makes electrical gremlins impossible to trace on the trail.
Why the Specs Matter on the Trail
40A coil side. That handles winches, compressors, light bars — the stuff that actually matters on a build.
-40°C to 80°C operating range. That's a cold Alaska morning and a desert summer under the hood in the same relay. It doesn't care.
IP66. Dust-tight. Water jet resistant from any direction. River crossing, mud bog, morning condensation — the contacts see none of it.
This is the relay you wire once and never think about again.
VIAI- "SEALED" Part #93944 — $23.95 — 12V and 24V
https://viaircorp.com/products/sealed-relays?srsltid=AfmBOop2BkpVlBxpfe05Jg-J3k3lxOqTRRVuYLy_8zLx8cPJnjV-za92&variant=43790066942113
Full install walkthrough → https://youtu.be/97txoICkVOo